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My friend is looking to add a red-tailed shark to her 29 gallon tank. The tank has one BN pleco, 2-3 banjo cats (she's not sure if she sees the same ones all the time, or if one has died!), some Endlers' livebearers, and a pair of paradisefish.

Would a RTBS be pushing it, and how would it interact with the other bottom dwellers?

RTB might be a problem when large as aggression comes with age and size in this species. But more likely that the paradise fish won't like the endlers, and they will be the major problem.

The RTBS should be fine. A solitary speciman will fit right in. I find that they are agressive with each other not so much with different species of fish.