02-12-2012, 01:27 PM
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Red Tailed Shark also gets aggressive, especially to other bottom dwellers like the Pictus Catfish. The Bala Shark is not a good choice, it get huge and will eat smaller fish and must be kept in a group and needs a much larger tank than a 55.
The Pictus Catfish likes acidic water and lower temps, and the Boeseman Rainbowfish likes basic water and higher temps.
If you click on the shaded names or use the "Tropical Fish Profiles" link at the top of the page in the dark blue navigation bar, you can look at the needs for each fish and compare/contrast fish size, group size, tank size, pH, hardness, temperature, activity level, cautions, and special needs.