I am new to this forum, and joined mainly to ask this question, but it requires a bit of a story first. I live in Phoenix but spent most of the last 6 months away, part work in LA, and part travel overseas. I never changed the water in my 3 gallon biorb. I did an some to make up for evaporation. I thought the fish would die, but my roommate did feed them micropellets. I had 3 neon type fish and a small catfish, that I think was/is a bumblebee. Needless to nitrates must have gone through the roof. The three schooling fish lived, but my roommate though the cat was dead and quit adding bottom food months ago. I came back and thought he was dead as well. Nope, when I finally changed the water he showed up. He was buried in the rocks/gravel. He was much larger, and I am struggling to figure out what he was eating. As soon as I changed the water he seemed to wake up and become more active. And started to eat the three schooling fish, one each day. Any ideas what happened? I don't want to get more fish for them to be a snack. But I am impressed that this guy survived 6 months without a water change and limited if any food.