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My hierarchy for eliminating BBA would look like this:
1. Good and consistent CO2.
2. Pretty strong flow through all plant beds.
3. Good NPK for the amount of light and plants.
4. Good traces for the amount of light and plants.
5. Consistent water change schedule.
I think you've addressed all of these concerns already, and it seems that you're doing everything right. Is the BBA all over the whole tank, including all plants? Just on older leaves / just on hardscape / just in one area of the tank?
I once had a bad BBA mess on my hands, and Tom gave me the following recommendationsspecifically to address BBA. As opposed to you, however, I knew I had bad CO2 and flow to begin with. But here it is, for what it's worth. Like I said, it did do the trick for me:
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You can do a few things here for CO2 and O2.
Increase the current and the patterning in your tank.
Do this first, add enough to not quite cause a break the surface tension.
Direct flow or add more etc to the plants, not away from them.
Do so that you have the flow traveling a longer distance and spreadi out as it travels to the plant beds.
Next, you can DIY a much bigger/higher flow reactor for about 10$ with some PVC. Ebay, sell the Dupla etc, some sucker will buy it.
I am using the Venturis for other reasons, I use them on some client tanks and they work damn well.
You can use these also, and a disc in the tank or both.
Up to you.
Some can use all three methods on their tank to compare or to see how each does for their system.
You need 3 needle valves to control 3 different systems, but that's not too bad.
Still, your issue can be solved by adding more flow through the Reactor(this will increase the response time to get a good CO2 level) and adding some surface movement(adds more O2 and degasses too much cO2 build up).
The end result means you can add more CO2 evenly and more O2 so the fish are much less influenced by higher CO2 ppms.
To help speed the BBA removal since you addressed the cause(CO2). drain the tank to do a 70-80% water change. Get Some SeaChem Excel, add about 50% water and Excel in a spray bottle.Add about 50mls of each in the bottle
Mist the infected areas till gone.
Refill tank.
Repeat 2x a week until gone.
Note, the large water changes will help and adding SAE's in there will also.
Add ferts and good CO2 thereafter.
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