If there is nothing to resolve, then what changes are you looking for? :p

:lol: Ah ha!! So, you're trying to resolve the brown algae. It does take some time, and I think some elbow grease will help speed things along. Undetectable nitrate and phosphate tests mean nothing when there is visible algae growing. Essentially, the biopellets (or other carbon dosing method) compete with the algae for nutrients and should win. You have almost double the biopellets per gallon that I do. I would just wait a couple more weeks before adding any more biopellets. If you add too many biopellets at once or you come to have too many biopellets for the demand of the system you will more than likely get cyano.

Diatom you mean? Biopellets won't help with that since it doesn't take up silicate :P Only time will heal that.

Thanks for bringing this up. I'm constantly forgetting that, and is probably one of the things that keeps me going back to thinking of some form of carbon dosing. I've just always chickened out before doing something.
Question for you Myka if you don't mind (and hopefully isn't de-railing this thread):

For vodka dosing, they say knowing your Po4 and No3 levels are crucial in figuring out dosing and when to start cutting back. But if you can't get an accurate read on those, how do you determine how much is too much? Or is this one of those instances where dosing the biodigest and bioptum are of real benefit seeing how you can't overdose theses?

Yes, that's true. There are a ton of brown algae though. Is it diatoms Marko?

I'm not sure if its diatoms. I've only ever had diatoms on the sand previously. But this time it's on the rocks and glass but not on the sand

I've not had luck with vodka dosing. It seems a balance that is hard to do imo. If your PO4 and NO3 are "undetectable" you just need to watch your tank closely. If you see a decrease in algae then stay at that dose, don't increase. Once the algae is almost gone then you need to back off the dosing. I think the PO4 and NO3 readings aren't are useful as visual monitoring, but give you a good place to start. None of these carbon dosing methods are quick fixes like some people hope them to be.