This tank is really only about two months old. every thing except (40 lbs new sand and about 50 lbs of live rock) came out of my 55 gal. It was 2 yrs old. The puffer is a new fish, I have only had it a few days. so far its been picking on my sand shifting snails only.. If it starts on my cleaner shrimp it will go byebye. we had one in the 55 gal, (jumped during move) it never bothered anything not even snails. I was hoping to get another like the first, but this one is deffently diff.