What else can I do?

[11purewater]

Dino's Kill it with fire!or peroxide

[Myka]

That could definitely be dinoflagellates. I've had success treating by elevating pH with kalkwasser drip/doser. Siphoning it out helps quite a lot as well, but you have to keep on it. Expect that if you are on the ball 100% that it may still take you several weeks to get it under control.

[molotov]

Just out of curiosity, how old is your tank?

[coolhandgoose]

Tank is almost 2 years old. But has been moved. I'm not thinking diatoms.

I tested phosphates this morning with lights out and they were .07. So they were definitely up from during the day.

So my plan is to do another water change this morning. Wait a few days, do another round of chemiclean with the ensuing water change. The box does say you may need multiple treatments.

If that doesn't kill whatever I'm dealing with then we'll start down the Dino route.

Also I run my cheato light at the same time as my main tank, should I run it at opposite times?

[Proteus]

When u decided to finally try peroxide go to a horticulture store. You can get it there at 35%