Thanks for the replies!!!
New tank
pH: 8.0
Nitrite 0.0
amm 0.0
nitrate 0.0
I'm using sponge/powerhead combo that came out of the goldfish tank he was in, as well as water from that tank. The sponge is well "broke in". I did put in new gravel on the bottom and not very much maybe 1/2" coating ...

Hello all, newbie here and am having problems with my eupterus (Gengis). I've had him for about 7 months and he began his life as a 2 inch dumped in my goldfish pond. He is now 7" and until recently has been holding quarters (over winter) with my goldfish in a 75 gallon. He began getting a bit nippy ...