well I came home today and my double red apistogramma agassizi male was dead in my 55. I'm realy unclear as to why. the past week he has been acting kinda odd. not coming out of the cave and being listless not eating, even turned down brine shrimp. everything else in the tank is doing great. the 2 females, the neons, glass cats, hillstream loaches. fish that i belive are much more sensitive to water conditions are doing great. Probably going to be one of those mysteries that will never be solved. hate to lose an expensive fish like that for no obvious reason. but thats all part of fish keeping.