the foam you say you saw in the water. Do you smell anything from the water?
You might have a fungal infection. I had a foam when I got one in my res.
The H2O2 didnt kill it or touch it really.. I drained and went with a bleach solution (about 10ml per 4 gal) to get to an optimum bleach level. (about 3.0 ppm) The plants are fine with it and don't mind the bleach at that levels that I have noticed. It might be an option for you. Just remember to drain the system and flush before adding bleach or the H2O2 will react with it and make your res salt water :P..
It might be worth a try. (a side note) bleach works as a PH down. So you might want to do a little planning when using it. It isnt a HUGE ph down and will adjust back a little while disipating.
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