Picture of CD Spindle Aquarium Cave
Aquarium cave made using a CD spindle with rocks attached.

This is my first Instructable and hope I did ok.
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Step 1: What You Need

You will need:

Empty CD Spindle( any size you want). I used one from a 50 count.

Aquarium Safe rocks or stones. I got my stones from bluffs along the Illinois river. I had them in the aquarium already, but just as decorations along the bottom. If you get your stones from nature, make sure you clean them very well. I even boiled mine before placing them into the aquarium.


Drill with small bit

Glue Gun or Aquarium Sealant

Any other decorations you want to put on the cave

Step 2: Cut Holes

Picture of Cut Holes
Cut holes in your CD Spindle. I cut 2 in mine across from one another, but you can cut as many as you want and anyway you want. I thought about putting one in the top, but later decided not to. You just want to make sure the holes are large enough for the fish to fit through.

Step 3: Drill Holes

Picture of Drill Holes
I chose to drill holes in the top of the spindle. This was done because I wanted to put my aerator hose up through the bottom of the spindle to have a bubble effect coming out of the top of the cave. If you do not want to do this, you can skip this step.

Just drill as many small holes around the center as you would like, making sure you do put some holes in the spindle itself. I almost forgot that part and would not have had a very good bubble effect if I would not have done it.
Is the plastic used safe for fish?
ahallock-14 years ago
Constructive criticism--if you do another one, consider using aquarium gravel that is from the "river rock" colour collection. It would detract less from your wonderful work of art. It is a fabulous idea! (Plus fish seem to live longer when they are surrounded by natural colours.) You could also introduce live plants to your cave surface, as you have a wonderful base for them to attach to--Java Fern LOVES surfaces like this! This is probably the first original cave I've seen that allows for really easy creation. Thank you so much for sharing!
buchd6 years ago
Be careful if you have a betta fish... Sharp edges can rip their fins. =)
Kaiven6 years ago
That's a great first instructable. And because the lid/top is removable, maybe find a way to put a light or formations in the cave...
geeklord6 years ago
good idea for a leopard gecko cave too
Scammah6 years ago
This is a great idea. I have some rocks stacked on top of each other for my small fish to hide in, and my placostomous (didn't spell that right I'm sure) keeps knocking it over. I'm doing this tomorrow.
i just call them a pleco
ve2vfd6 years ago
Great project!!!!