I have a 125l tank and have 6 spotted corys.
there seems to be 3 bigger ones that are visible in the tank, yet there are three slightly smaller ones that hide constantly underneath one of the ornaments in the tank. (its ruin with a hollowed out bottom)
i have been told not to worry, but i never see them unless i move the ornament.
Is there anything i should worry about? or is it just that they arew smaller?
BTW, have my water tested once a month, no ammonia, or nitrites and very low nitrates, so dont think its water quality, and i have deliberately gotten 6 plus 3 smaller black corys so that there is a decent number to avoid bullying.