correct me if im wrong Nh4 is ammonia (total)
over feeding, with a combo of lack of water changes..
i dont know about your tank... but ill be honest my tank is under pound per rocked/gal
and ive beat the hell outta my tank.... from time to time.. never saw Nh4
maybe you lost a fish and had a domino effect?
keep up the water changes.. (only if correct) you should be able to back to back em...
what salt do you use? just by chance.
i can do water changse as fast as i can bring the temp of the RODI up..
I maintain my RODI holding tank at 81.. i run all my systems at 80..
i never really got in to the % thing with Wc's, more less i do 10g ever 3 days on my 30, and 5 on my 10 once a week...
never lost anything.. i almost dont have to acclamate between tanks.... dont do as i do for it is bad practice.. but feel it out....
Im woundering where the ammonia came from.... somethings missing.