hey guys for some reason i been havin bad luck with these guys.have had 6 and they seem to be dieing. two with a filter change but left the old filter running so i could avoid an amonia spike.i have in my a tank 40 baby texas about 2 weeks old the some other older ones. the rest are still alive but the algea eaters are dead why i dont know. them seem to be really sensitive to water change. any thoughts?????