I was free and clear from my initial diatom bloom for awhile, but it came back over 2 weeks ago, and it's still present.

Last time, my CuC did a fine job in eliminating it, this time I'm not sure if the algae has gotten too long for them, or what the deal is, but it doesn't seem to be going away. I know that these can take time to go away, as well. But my initial one did not last this long, and I'd really like to be rid of it.

My Nitrates/Phosphates/Nitrites/Ammonia are all at 0 or undetectable. Alk is 9.0, Calcium 420, Mag 1500, Salinity 1.025.

My skimmer is working good, and I have a PhosBan reactor running carbon through it as well.

I don't think I am overfeeding my tank, a pinch or two of New Life Spectrum to feed the couple fish I have in my tank, my shrimps, and keep the snails & hermits happy and that's it.

I am using RO/DI water, and my TDS meter is reading 0 on usable water everytime I run it, and I am checking.

The tank is near two windows that are not covered; that is soon to be rectified, but that cannot be the only contributor, I'm thinking?

Is there anyway to help the process, here, besides what I am doing? I've read more recently some people will use a toothbrush to brush the algae off the rock. But, that's not going to really solve my problem if I don't figure out why the algae continues to bloom and propogate.

Any insight or help here would be greatly appreciated.