Older thread but i'll throw some info in.
I'm fairly new to the hobby 6ish months and I inherited a 29 gal biocube which had been ignored for quite a while.
I run a mixed reef with zoas, mushrooms, LPS, and SPS.
NO3 started out around 50ppm and pO4 was at 0.6ppm. After moving the tank and it went through a mini cycle with cyano and hair algae.
After tons of research i pulled most of the coral rubble out of the AIO compartments in the back and only kept about 1/4of it which i put into media bags to keep it organized. Added a fuge light in the middle compartment and grow a lot of cheato as well as added a protien skimmer in the first compartment as well as purigen, phosguard, and carbon in the third compartment before the return pump. I use filter floss after feedings amd after i blow detritus off rocks until water cleans up then i remove it.
As of last night my parameters are:
NO3- 5ppm
PO4- 0.2ppm
It has stayed pretty stable there since i added the refugium section of the tank.