What to do with my sump...
Hi, I need some help it's my first tank with a sump, main tank 300L. Sump has filters and skimmer then bio balls then return pump. Have had the tank for two months and already the bottom of the sump is very dirty, should I empty it to clean the bottom?
Should I take the bio balls out there is a plastic shelf with holes they sit on, do I leave that in and put live rock in there? Should i put some sand in there too?
Any advise or pictures would be grateful!!