wow this is a awsome site so many replies in ine night, i know i realy need a bigger tank but they cost a lot and i realy dont want to get rid of him because i realy do love this fish he is defently a part of my famliey, but i clean the tank with at lest a 50% water change every week because its such a small tank and every time i check the water and add all the chemicals he likes, but i allways thaught that gill thing was just old age ya know like it just grows as he grows but if you guys say i need to take care of it i will. and i allso didnt know its not good to feed him worm. i dont do it often but when i do he loves it. i usely feed him 85% large pallet that i buy special for him though my fish store. i feel realy bad for having him in such a small tank and i wish i could get him a bigger one but its out of my cost range. maby i should start saving up to make my own fish tank because they cant be that hard, idk all i know is i love this pacu. lol i reamber i use to try and get hm tank mate because sometimes i think he gets lonely but he allways eats evertything i put inthere and i kepp him fed but he still eats um. o well right, but thank all of u for your comments. it helps a lot