so there are 2 knifefish in this tank then? They could definitely stand the upgrade as there may be some bloodshed in the future as their size increases. You just got them in the tank, some of my fish take 2-3 weeks to start eating for me.He's about 6 inches. He's in a 60 gallon with an 9 inch snide fish. The pet store told us that the ppl who dropped them off said they have been in a 55 gallon together for roughly a year. I know they are going to out grow tank but I feel separating them right now would only add to their stress. The CKF isn't eating either.