ok ill try and answer your questions.
basically it was a second hand tank i got from someone. it was a mess when i got it but have brought it up to scratch. limited LR
sponges in canister filter. protein skimmer was not working properly. i have had the tank now for a few months now. i got the protein skimmer working. have done several water changes. added more LR
and also removed the sponges and replaced it with purigen. seems to be ok now.
only feed twice a day. mixture between frozen meaty food. pellets and nori. but only feed what they can eat in like 1 minute. no food is ever left over.
anything else? just ask.
also thanks for the tip with the coral.