Cyano :(

[Myka]

Just follow the instructions on the box. You may need to re-dose again next week or so.

Fwiw, your tank looks quite mature, how old is it? Your rocks also don't allow real good flow around them. I think it's time for a revamp. Cyanobacteria is VERY good at utilizing nutrients and can even bind nitrogen, so even a very small amount of nutrients in the system is enough for cyano to flourish. I have a feeling there is a fair bit of nutrients in your tank, but the cyano is utilizing it so it's not in the water for you to test.

[Myka]

Haha, good ole reefing advice - conflicting.

[martinmcnally]

Your right l should get a new bigger tank haha.

It's about 2 years old the rock is much older. If I increase the flow anymore it whips up the sand

[Myka]

Originally Posted by martinmcnally

Your right l should get a new bigger tank haha.

It's about 2 years old the rock is much older. If I increase the flow anymore it whips up the sand

Haha good plan!! I don't mean increase the flow, I mean adjust the rockwork so that the flow can get around the rock better. It looks like it has a lot of areas for it to settle. Your tank looks older than 2 years. I guess you're good at growing corals.