yikai

I used to have those, the whole tank was brown for 2 months... then i gave a try to the volcano sand Iwarna brought in, within 2 weeks ALL brown stuffs were gone!!! Not sure what was the link though...

Time to take stock of ya tank...reduce livestocks,maint regime, etc. Ya tanky (1 yr?) couldn't cope with ya nutrients load resulting in imbalances in ya overall system.

I have very little fish in my tank... Impossible to have high load. I stock selectively and I dont anyhow buy fish. I do regular water changes. Dinoflagellates is not caused by PO4 and NO3.. It's a tricky and elusive algae that many ppl eve established tanks can get