03-04-2009, 03:23 PM
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A 350g tank might be appropriate for freshwater rays, but you have some other issues with your current stocking list.
3 Plecos - grow to 18" (if you've got common plecos) but this should be no problem in a 350g tank
2 Irridescent Sharks - grow to four feet and are fast swimmers. These things need thousands of gallons and tons of swimming room. Not appropriate aquarium pets. They'll also eat anything that fits in their mouths, including all of your other fish.
2 Angel Fish - It would be cool to set up a big Amazonian tank with angels and huge schools of rummynose tetras, cories, and different types of plecos. Maybe even the rays (nix the cories).
2 Columbian Sharks - These aren't freshwater fish. Young ones can survive in freshwater but as they age they really require brackish or even full marine conditions. They also require a very big tank and are quite predatory.
2 Ropefish - These oddballs are hard to keep with other fish. Small fish will get eaten, while other fish in their size range are usually too aggressive to be kept with ropefish.
1 Cichlid - This is a zebra, correct? If so, it shouldn't be kept in a community tank. It needs hard, alkaline water and a diet rich in vegetable matter. If it has access to the meaty foods you'll be feeding the other fish, it will eat them but this isn't healthy for it. It can develop bloat, constipation and other disorders if it eats too much meaty food.
If I were you, I would get rid of the Colombian sharks and iridescent sharks altogether, move the other fish to the big tank, and turn the 55g into an African rift lake tank for your zebra and a bunch of other rift lake cichlids. Then, you could build the big tank around the fish you'd be putting in there, or even come up with some different ideas altogether.