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3D Aquarium Background

3D Aquarium Background

This instructable will show you how to make a cool 3D background that goes inside your aquarium and looks like real rock but only weighs less then a couple of pounds.
 
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Step 1What you need

What you need

You will need the following

Tools
Razor or Box knife
Foam cutter or maybe electric knife (both are optional)
Ruler or other sutible straight edge
Marker (sharpie)
Tape measure
Caulking gun
Hot glue gun (optional)
Cheap paint brushes, all sizes
Wire brushes
small buckets
Tarp (optional, to keep mess at a min)

Materials
1 inch pink foam board (the kind you buy at Home Depot or Lowes)
100% Silicone for caulking gun (GE silicone 1 is what some recommend) I used the Red Devil Architectural Grade.  As long as it does not contain any mold or mildew inhibitors and is 100% silicone it should be fine.  The less ingrediants the better IMHO. 
hot glue (optional)
Cement or cement overlay
Cement coloring (optional)
Small finishing nails

Note on pink foam: There are two types, one has a plastic cover on it (vapor barrier I think?) and the other does not.  I bought the one that did not have the plastic on it.  If you buy the one with the plastic on it, you will have to peel the plastic off.   Also if you have access or want to buy more foam, you can buy several thickness of the stuff to help create different thick and thin layers.  I just used one sheet of 1 inch stuff and glued it together to get the thickness I wanted.

Note on hot glue:  I have read where some people used hot glue to glue everything together instead of silicone.  It is faster and it shouldn't pose a threat to your fish.  I used a combination of both, hot glue on the smaller pieces and silicone on the larger pieces.  Its up to you.  Trying to get hot glue to come out in the quantity I needed on some of the large pieced didnt work.
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72 comments
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Aug 25, 2011. 11:11 PMJD101 says:
Do you think you could use planters foam for this type of project?
Apr 1, 2012. 8:31 AMdavid547 says:
Planters and florist foams would be OK only after full leaching. They contain salts from the manufacturing process. Talk to your local florist and read the instructions for use. I would do water sample tests on the leachate to be sure it is ready for an aquarium. After leaching you can let it dry before starting the manufacturing process.

A. Grower Wholesaler
Oct 12, 2010. 10:34 AMPseudocrenilabrus says:
Yes, cement leaches out a lot of calcium and raises the pH drastically. Of course, some fish such as African Cichlids like a high pH, but anything over 8.5-9.0 would be too high even for them. Draining and filling is the only way to rid it. DON'T be tempted to use those pH reducers they sell in pet stores. It will only work a short while, then the cement will cause the pH will zoom back up killing everything in your tank. Just a heads up.
Feb 3, 2012. 9:09 AMdutchthunder says:
I've read adding vinegar to the change water helps buffer as well?
Apr 8, 2012. 10:38 PMwinterwindarts says:
Portland is what you have to worry about-it's made from lime.
Jan 13, 2012. 4:03 AMsplitzwit says:
excellent work...think i will try something like this....if i can get all the resources together...i am living in ireland and priced one of the ready made 3d backgrounds and would of cost me €185...thats when i found yours...
Nov 30, 2011. 2:56 PMHubertF says:
what did you use for paint/dye to color the last coat of cement?
Oct 19, 2011. 10:33 AMTinkerWorkshop says:
What glue would you recommend for gluing the pieces in?
And how heavy was the final product?

My only issue with this scale of a wall is that my tank is probably 1/3 of yours, if not smaller (a square 50 gallon, if I remember correctly). Would you say that the wall would still fit in well?
May 28, 2011. 9:38 AMthats mr sonic to you says:
awesome
Feb 23, 2011. 10:34 AMfatmuemoo says:
Hi, I know this post is somewhat dated but I have to questions for ya:
1) How hard is it to keep clean? I know you mention you scrub it occasionally but is that no big deal or does it become an all afternoon event?

2) Do you really have to glue it to the tank? Seems so permanent. Have you ever experimented with other options for keeping it in place?

I love this instructable and i'm thinking about doing it on my 75 gal turtle tank
Mar 21, 2011. 1:58 PMpyroarchist says:
if you glued the pieces together plumb on the back then made it concave like an eighth of an inch on the back and put the suction cups on that you would essentially get rid of the gap in theroy wouldnt you?
Feb 12, 2011. 10:35 AMjuicepig21 says:
I am VERY impressed man! I tried to do this with those white grates that cover fluorescent lights and triple-expanding foam.. It was horrible to work with and failed miserably. I really wish I had gone this direction with it. It would have been stronger and (if I was lucky) could have turned out as nice as this one. I would like to see a pic of the populated tank after a little algae growth and such. It must look great.
Feb 2, 2011. 6:13 PMalibabbarudolph says:
I am in the process of making a similar project. I am making a basking spot for my bearded dragon(lizard) out of 1/4" plywood, then i am going to use your method of applying concrete to protect my lizard from the glue used in the plywood... Hopefully it comes out looking as nice as yours!
Feb 4, 2011. 9:19 PMalibabbarudolph says:
ill do that hopefully, will probably be a week or two tho since i only work on the weekends
Feb 7, 2011. 4:55 PMalibabbarudolph says:
yes exactly, except it is school for me
Dec 25, 2010. 4:41 AMihsanadipra says:
beatutiful,
i hope can make like this
thanks
Oct 19, 2010. 1:16 PMkeepingstephen says:
Looks top notch. Love to see a picture of it with fish and plants added.
Oct 17, 2010. 1:59 AMmakaay says:
Hi bro,
one question in my mind. use cement for color that any side effect to fish.reply plzzzzzz.
Oct 7, 2010. 11:19 PMTape-structable says:
Looks very professional and real! Very nice job. May I ask what kind of fish you will be putting in?
Oct 8, 2010. 3:48 PMunderwhelmed says:
Really nice background. I've seen similarly constructed backgrounds online before, but yours looks the best.

You can use expanding foam (Great Stuff Brand) in place of hot glue. It is fish safe. Pond builders use it to secure "stones" when making waterfalls in ponds.

With Goldfish you should consider other cool water fish.

I like the high finned Chinese banded sharks (bad name for a great fish IMO) with goldfish, they are very docile and add a different color / shape to the tank.
http://www.csupomona.edu/~jskoga/Aquariums/myxocyprinus/myxocyprinus.html

Another nice cool water fish that do well with goldfish are White Cloud Minnows-
http://www.aquahobby.com/gallery/e_tanictis.php

They are nice fish, visually similar to neon tetras when young and they school quite nicely as well.

Plants will be tuff with goldfish, unless you plant them in pots. Tera cotta work well as do the cheap plastic ones you get from the nursery. A quick coating of Krylon Fusion paint makes them more appealing, and small stones as a top dressing should help disuade the gold fish from digging too badly in the pots.

Plain clay kitty litter makes an excellent aquatic potting soil, BTW.

I would also recommend either Mystery snails or apple snails to help clean the tank. I know some fish keepers aren't fond of snails because they either reproduce in huge numbers or eat all your plants, but these don't eat plants and lay egg clutches above the water line where they can be removed if you don't want babies (they can also be sold on aquatic auction sites like AquaBid.com)

As an aside, perhaps an instructable or explanation of fishless tank cycling would be helpful. I am familiar with cycling an aquarium using straight ammonia and assume this is what you are referring to.

Good luck with your aquarium, it looks good so far.
Oct 8, 2010. 7:40 PMunderwhelmed says:
Well, with tropicals you would have a much broader palette of fish to choose from.

Very nice, well done. I wish I had your artistic abilities.
Oct 8, 2010. 11:52 PMunderwhelmed says:
Well he would be happy in as large a tank as you can provide him, but by heating the tank for tropicals he will become stressed. So, I guess it's a bit of a catch 22.

BTW, I'm a forum member at a fish geek site called aquaboards.com, I posted a link to this instructable in their DIY section. I hope you don't mind. I thought it might bring some people here who might never hear about instructables otherwise.

I keep my goldfish outside in a horse trough, I cut and set it into the front porch / deck. It has been running year round for the last 10 years and the goldfish are all very healthy. Much cheaper and longer lasting than a preformed plastic pond.
Oct 15, 2010. 5:47 PMunderwhelmed says:
Sorry about that, the forum changed hosting last week and it has been problematic for people to sign in.

Usually you have to wait for a verification email from the site admin before you can log in. It's sort of tedious, but the owner is trying to keep the forum spamming to a minimum.

You don't have to be a member to read the Forum, AFAIK, only to post or reply.

Here is the link-
http://www.aquaboards.com/showthread.php?72604-DIY-background

Aquaboards and instructables are my must check daily websites, so I was hoping some of those posters might find their way here. It is an older age demo, so maybe not, but stranger things have happened.
Oct 12, 2010. 10:46 AMPseudocrenilabrus says:
Using vinigar to clean the glass will allow the silicone to stick better. A lot of the times when silicone gives way, it's because the surface wasn't properly prepared, though it may not matter with this so much. Still, cleaning with vinigar and then wiping it dry with a newspaper (a towel or cloth will leave lint and weaken the joint) will increase it's strength.
Oct 12, 2010. 4:25 AMmakaay says:
why give support ?
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