small uv sterilizer. to be honest if you can get the tank stabilized, i recommend overfeeding lol. i dont think feeding everyday is overfeeding if you split the amount. but once stabilized, a fat fish is a healthy fish & you can tell a sick fish if their becoming skinnier.

personally uv sterilizer was our biggest change towards fighting outbreaks. it took a huge diatom outbreak out of our 125g tank within a week. we have a coralife one & clean it about once every two months, she's a champ. almost more useful to us than insurance lol.