Bob wrote: <<<<< Stressed fish (...) He got really listless and hid under a rock with his mouth open. The next morning he was dead {:( That same day I had a spawn in the 20-long with three pairs and a couple hatchets in it. Today I saw the same symptoms in one of the sub-dom males in that tank.(...)>>>>> Diseases are not easy to recognize in apistos, however considering that the problem seems to be spreading, and that hatchets are wild-caught fish with a reputation of being quite prone to disease, there is the possibility that some pathogen is causing this. Probably high temp. (93 deg. for a week, which however some fish do not tolerate), or 7 drops/10 gal of Rid-Ich plus (to be repeated every three days for four times; add aeration and keep the temp. normal) are good option to put under control gill protozoans (temp.) or gill flukes (Rid-Ich). This is assuming that there is no ammonia problem. Good luck Dionigi Maladorno dionigi.maladorno@roche.com This message presents personal opinions which are not necessarily those of my employer.