BBA and Flourite

I've had the tank in my signature going for about 9 months. I have had BBA most of the time. I have tried everything to get rid of it to no avail. I do 50% water changes every week. My pressurized co2 is a constant 30ppm or above. I even tore the tank down once and cleaned all the fittings and changed all the water, but it just keeps coming back. I don't know where it came from initially, but it is in the substrate now. It grows on certain pieces, iron containing pieces I assume. Any way I am about ready to scrap it all and start over with some plain gravel so I can better control the trace nutrients. I have to questions. First, will the spores from the BBA be in my cannister filters? Will I need to start over with them also? Second. I have heard that you need to let your fish clean out. If I put them in a small tank for 2 or 3 days, will that be enough time to purge their digestive systems of any BBA that may be in there? Any ideas or suggestions would be appreciated.

Oh yea. I am dosing ferts. 1 teaspoon k2so4 with water changes, 1/2 during the middle of the week. Kno3 as needed to keep Nitrates above 10 but below 20ppm. I have kh2po4, but I don't need it much. I keep my phosphates below 1.0. I am using flourish once a week for traces. I have also been dosing Flourish accel in addition to my co2.

Here is how it looks on the rocks. Best picture I can do.

Anyone at all?

This is how heavy it is planted. It would be denser, but I have to cut out the BBA all the time.

phanmc said:

How are you measuring CO2?

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Filling a glass with tank water. Running a bubbler in it for 4 hours, testing the ph in the glass and the tank, then comparing the drop in ph. Its dropping form 7.6 to 6.4.

Thank you phanmc. I will give that all a try.