What else can I do?

[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?