Here we go again talking about algae.
My recent experience with BBA:
6 ft long tank full of manzanita wood. Covered in BBA. Must be two 5 gal. buckets of it if I decide to collect it.
Showed up after a few fish died in the tank and I didn't remove them. BBA took over in 2 or 3 days. I believe that BBA shows up when organics are increased and present.
Let tank be for 4-5 months. BBA became splendid. Most people visiting my house love the tank.
Decided to spot treat with Excel. Squirted 10 ml. over an area 5" x 1". BBA turns blood red on Day 2. Falls off on Day 5-7. Leaves clean wood. Does not return on that spot. Repeated that on 2 more spots. Same timing, same result.
Nice! But also at the time of the first spot treatment I put a golf ball sized amount of BBA in a cup of aquarium water with 25 ml. Excel. That's the equivalent of adding 2.5 gallons of Excel in a 25 gal. tank. The BBA in the cup never turned red. It never died. It died only after I added more Excel to the cup.
To me BBA is a sign of poor maintenance practices. It'a creature that can withstand salt baths, pouring boiling water over it, even bleach.
--Nikolay
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