Went to a local fish store and purchased this beautiful blue whale. The car said that he would get a long well with my other fish which are, parrot fish, tinfoil barb, albino flat nose cat, upside down cat, and clown knife.All have been getting on fine.I'm just wondering what the specifics are on the blue whale.in case you're wondering, my tank is between 100 and 150 gallons,i feed them shrimp pellets our small to medium feeders. Any suggestions on fillers for tank like plant s or would it be better to keep the gravel i have or change to sand. My clown knife like to hide, but i rather see him, what kinds of open hiding places do you guys suggest? I have pics will Post as soo as i figure out how to.