fish disease from skipping preps, not any param issue is the bet.
to source the claim: read stickies in the fish disease forum compared to tank assembly steps and timing, see if that eliminates fish disease right off the bat or elevates it to #1 contender. reefs like that above don't run low on 02. the reason all your params line up and only an unspoken cause still exists is because we haven't reviewed fish disease yet in a tank using chromis.
to source the claim: read stickies in the fish disease forum compared to tank assembly steps and timing, see if that eliminates fish disease right off the bat or elevates it to #1 contender. reefs like that above don't run low on 02. the reason all your params line up and only an unspoken cause still exists is because we haven't reviewed fish disease yet in a tank using chromis.