I only use ro di water and this tank is only fed every other day. Tank is my 75g. 30 lbs of LR, 6inch sand bed, macros, crabs, snails, 1 peppermint shrimp,
and 1 gobie. That is all that is in this tank. It has a 20g sump with an ASM skimmer, live rock rubble and chaeto in the sump. From a practical stand point, there shouldn't be any algae issues in this tank at all. I will test phosphates and see what I come up with. the return pump is mag 9.5 and I added a powerhead for added circulation just in case it was from lack of water flow. It didn't help so far.


Ok phosphates are 0 now I'm really stumped by the algae.