Re: I know this is a big topic on here Iíve been going over it for the last few dats
I think the main source of your mold is from the Cholla wood. It either needs to stay dry or be submerged, there isn't an in between. Removing that wood would remove 75% of the problem. The other option, since there are no frogs in there is misting the mold area with hydrogen peroxide. It might damage the plants, but it won't leave any nasty chems in the tank.