How to Select the Right Fish for Your Aquarium




Choosing and selecting the right fish that could live together in harmony in a community aquarium is sometimes a complicated process because there are many things to consider and it basically involves some basic research and work.

The instructable here is meant to share the idea and hopefully it help you to make the right decision. More information can also be found at

Step 1: Research and Info Finding

The first step towards your research is to find out as much information as possible about the living condition suitable for the fish. There are different sources which you can refer to and all these are easily available from the internet or library.

Step 2: Grouping Into Same Requirements

Fish basically can be grouped into saltwater or freshwater fish and it can be further divided into either those that live in tropical region or coldwater species. Saltwater fish need addition of salt with certain salinity to survive while freshwater fish is much easier to care for as no addition of salt is required.

Fish that belongs to tropical region generally will thrive in aquarium water ranging from 24 to 30 degrees Celsius while coldwater fish demand water temperature between 18 to 22 degrees Celsius. Therefore, in order to establish your community aquarium, you will need to select the fish that has the same requirements.

Step 3: Compatibility

Once you have done that, determine compatibility between each individual species. Certain fish are aggressive while others are peaceful. Therefore if you intend to get the right fish to mix together, make sure those aggressive types have their own tank isolated from the rest while grouping together all the peaceful community fish into the same aquarium.

Step 4: Determine Full Grown Size

Another important consideration is to make sure that the fish tank is able to accommodate the size of full-grown fish species that you've selected. Don't be deceived by size because certain species if properly cared for can grow to very large. Your main aim is not to overcrowd the space that will lead to poor water quality.

Step 5: Make Your Purchase and Monitor Development

Finally, once you've made up your decision then you can go ahead and scout for your perfect fish and make the purchase. After you've introduced your newly acquired pet, the last and final step is to monitor their development and make sure all fish can adapt and live together without problems.



    • Safe and Secure Challenge

      Safe and Secure Challenge
    • Faux-Real Contest

      Faux-Real Contest
    • Toys Contest

      Toys Contest

    14 Discussions


    4 years ago on Introduction

    is it possible to get fresh water fish like panfish or rock bass for my tank? and if so hiw big of a tank do you think i need?


    5 years ago

    Bettas are fine with other fish most of the time. Only if theres one at a time. Theres never a time i havnt had a beta in my tank. My angelfish doesnt bug anyone either. To start i would recommend gouramis. Theyre hardy fish last awhile and are cheap. Plecos are very fragile. My fish in the 6 year ive had them, no one has ever fought. I mix semi agressive (i.e. red tail sharks) with community (i.e. mollys) just remember that angelfish dont go good with neons or guppies :)


    Reply 7 years ago on Introduction

    they generally attack nothing but bettas, they are very good in community tanks with tetras or other community fish, the rule is 1 betta per tank or they will kill each other.


    Reply 7 years ago on Introduction

    I think, you have to keep male betta in separate tank, there is no issue with female betta...


    Reply 7 years ago on Introduction

    Male bettas are fine in community tanks so long as there is only one and it depends on the temperament of the fish, my best friend has one in a 15 gallon with some black skirts and an ancistrus pleco. You can do more than one with females, but if you just want one the males look way cooler.

    Also dont put tiger barbs and bettas together, because bettas are slower moving fish, tiger barbs will go for the fins of the betta. Just saying.


    9 years ago on Introduction

    it woul help a whole @#$# of a lot more if you actually noted info like (for example) a plecostomus gets 24" and you need at leat a 20 gallon with plenty of rocks and algae. :)

    4 replies
    Nebraska Gbassmonkey

    Reply 9 years ago on Introduction

    please tell me you are not talking about a common pleco? a dwarf pleco species you could probably get away with (they grow to be about 4-7 in.) but, the common would require a much larger tank (55 gal. minimum) the general rule of thumb is 2 gallons to every inch of fish. how long have you kept fish?

    manlyfishNebraska G

    Reply 8 years ago on Introduction

    actually its 1 gall per fish but first you have to have the min gall
    for example you have like 6 guppies, and 3 panda cories
    guppy=10 gall atleast
    panda cory=15 gall
    and all your fish are 2 inches long so you so 6+3=9+15=24 so you would need a 24 tank but thats just a guesstiment different fish have diff requirements and it may depend upon their personalty some fish might be fast and adventerous while others may be slow and content behind a rock its pretty hard to tell but always have as much room as possible so if you ever see that really cool fish on sale...hehehe just research first


    8 years ago on Introduction

    Common Plecs may well get big eventually but the key word to remember is "eventually" not that I believe its nice to breed fish that will get too big for the tank but for example I took 2 Common plecs off a friend who had a much smaller tank and one I gave to Bristol Zoo when he grew too big and the other I still have happily in my 128L tank. He'll be fine until he's more than 7" long.

    It's not the greatest Idea to 'buy' common plecs but adopting them I think is fine provided you've got somewhere that will look after them when they're big and demand more space.