today all my red cherry shrimps died because of my surface skimmer broke edy last saturday
just got back from work, then see the surface very bad and thick with protein oil and all shrimps died.

i think they must be suffocate for oxygen, since all snail also going up near surface.

not sure if overfeeding cos i feed small amount only and all fishes can finished it in less than 10sec. yeah, i think might be overdose co2, cos cos2 cant get out from surface and o2 cant get in.
my surface didnt have much agitation, only from fan.
last night install new surface skimmer and all oil gone edy. tonite will do some water change cos i forgot to do wc yesterday after trimmed the riccia.