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New Member
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Last Login: 5/14/2011 7:39:15 PM
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I am thinking of getting a 20 gallon tank and there is a page on fishchannel that shows begging match ups but it shows cardinal tetra's which prefer soft water and Red Tailed Sharks which prefer hard water i want to get them both in the same tank but i don't know how to give each what it likes. can some body help me?  
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Advanced Member
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Last Login: 3/4/2013 1:51:29 PM
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Neon Tetra5 (2/13/2011)
I am thinking of getting a 20 gallon tank and there is a page on fishchannel that shows begging match ups but it shows cardinal tetra's which prefer soft water and Red Tailed Sharks which prefer hard water i want to get them both in the same tank but i don't know how to give each what it likes. can some body help me?
well, how bout this:
RTS are too big and aggressive to keep in a 20gal. problem solved 
if you dont like that answer im not sure what to tell you, I havent looked at that page. but seriously, you can't keep RTS in a 20.
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Summer tiiime, and the livin's easy...
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Starting Member
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Last Login: 9/23/2012 5:18:30 PM
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I have kept a red tail shark in a 20 gallon tank before and it was fine when it was small. As it grow it started to get stressed and was getting aggressive. Eventually it got sick and died. I wouldn't get a red tailed shark for a twenty gallon tank, but there are plenty of other cool fish that would work with tetras.
- 55 gallon: 6 Cherry Barbs, 5 Diamond Tetra, 1 Pearl Gourami, 1 Bristlenose Pleco, and 1 Upside-Down Catfish.
- Planning to add: 12 Cherry Barbs
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- 20 gallon: 7 Multi Shell Dwelling Cichlids
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- 10 gallon: 3 Celestial Pearls Danios (Soon To Be 12) and lots of Cherry Shrimp.
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- 2.5 gallon: 15-20 Yellow Cherry Shrimp and a variety of Snails.
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Advanced Member
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| Did you steal my name? >.> <.< (JK)
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New Member
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Last Login: 1/14/2013 9:54:54 AM
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I don't think that anyone else has asked this befoe so I'm going to. Have you ever kept fish before? Because if you haven't I wouldn't exactly suggest getting cardinal tetras as your first fish. Sometimes they cam be extremely touchy to water quality.
26 gallon Bowfront 7 Serpae Tetras 2 Glass Bloodfin tetras 3 Julii Cories
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Starting Member
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Last Login: 3/18/2011 6:52:05 AM
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| i don't see why you can't keep both i have kept Red Tailed Sharks in a 10 befor they arn't aggressive they are just doing what they do. just get both!
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Average Member
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Sam fish (3/18/2011)
i don't see why you can't keep both i have kept Red Tailed Sharks in a 10 befor they arn't aggressive they are just doing what they do. just get both! This is ABSOLUTELY not true. obviously you no longer have these fish for a reason. they not only wont get along in that sized tank but they DO want different water conditions. cardinal tetras are not easy and they need specific water conditions or they just arent going to live. and a ten gallon is ridiculously small for red tailed shark. it gets too large and too aggressive for either a 10 or a 20 gallon. again, please dont give advice on things that wont help anyone. you are recommending something that you dont know much about and if this person uses your advice, they are just going to fail in the long term.
4 gallon Finnex pico aquarium- Iwagumi tank with orange eye black tiger shrimp.10 gallon- Planted Asian biotope with CPD's, sparkling gouramis, and a breeding pair of Betta albimarginata. <link to pics of my tanks- http://board.fishchannel.com/Topic225475-16-1.aspx>
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New Member
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IMO, just because you kept a fish for awhile in a particular setup with everything seeming to be fine don’t make it right or OK to do so. Some fish are just not meant to keep together because of some type of incompatibility. You don’t keep large meat eating fish with small fish because you will be constantly getting new small fish for the obvious reason. Same goes for keeping freshwater fish with saltwater fish due to salinity incompatibilities and you don’t keep cold water fish with warm water fish. We as fish-keepers have to make choices that sometimes we don’t like but are necessary for the fish’s health over the long term. Fish profiles were developed to help the beginner as well as the more advanced keepers in making these choices easier. Do your homework first by reading the profiles of the fish you like and then post your questions. You may or may not like the answer you get but it should help you make the right decision on which fish to keep. I chose to raise mollies years ago to sell to pet stores simply because I like them and they are very easy to bread. Over the years I have became real picky about how many adult fish I keep in a particular tank size as well as how many juveniles I keep in a tank. By being picky it has made the job easier to keep my water quality good. Some commercial fish growers get away with over populated tanks for a short while but that don’t make it the right thing to do for the fish. Just go visit with any pet store owner about the number of fish they loose right after they get them in, did the bottom dollar line make it right, no, but they got away with it because they weren’t keeping the fish long term. As a new fish-keeper there are lots of thing to learn and some not to easy to understand at first but reading a fish’s profile gives you a jump start on knowing how to care for your fish. The profile will let you know what to feed, what water quality is needed, and what other types of fish are compatible with your fish. This will make it easier and safer for your fish.
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Average Member
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Last Login: 2/21/2013 6:54:53 PM
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| Be aware that most fish have a pretty decent length lifespan. It's not just a few months or a year or 2. The "I did it and it worked fine" response is used by alot of people who had these fish doing fine for a short period of time and then they "mysteriously" started dying or "disappeared". Seen it many times. just because they immediately keel over or begin to murder each other right away doesn't make it a good situation. Most responsible people on this site will tell you their advice as being "on the side of caution". We try to give you advice that will save you the headaches that we have personally had, or seen in the hobby. If you get advice that is probly best not to do it, it means at the very least to think twice about it.
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