I actually have two different solutions made up that I use in my DC. One is 4dkh and the other is 5dkh. I check the solutions each time I change the solutions in the DC. They are both made with deionized water. When I change the solutions, I clean the DC well, followed by a rinse with either the 4 or 5 dkh solution and add 3 drops of the Meth Blue. Is is a Red Sea DC.

When I use the 4dkh the DC getts pretty yellow, when I use the 5dkh it stays a nice green color. I don't let my yeast solutions run very long to try and keep the output as consistant as I can. The DC is on the opposite side of the aquarium than the reactor.

I am using a homemade in-tank reactor. 1 1/2" thinwall tube with the C02 entering mid way and a zoo med micropump pumping water into the top of the reactor. Appears to be desolving the C02 very well. I have a very small amount of micro-bubbles that push out the bottom of the reactor. I have the bottom plugged with fairly fine filter material.

Regarding the BBA, my original thought was it was a circulation issue also. I am running an XP3 wide open with a spraybar slightly rippling the water surface. The odd part is, the BBA is showing up mainly on the top plastic part of the in-tank heater and in a couple spots on the substrate. Both areas have enough circulation than you can see the BBA waving in the "wind".

Also, what are your thoughts on the K2S04? Not needed with my other ferts? Any chance the additional Potassium is causing the BBA?

Thanks Hoppy,

Mike