How much bleach can my plants handle?

I'm fighting a nice crop of bba and thus far bleach has been the only thing that produces any change in it. However it doesn't seem to have killed it off, just lightened the color of it to a lighter greenish pink and the base of where the bba is growing from is still dark green. I'm using a 1:20 ratio and soaking for three minutes. The plants I've tested in this have no apparent negative effects from the soak after two days. So I would like to try increasing either the length of the soak or the concentration. Any suggestions for how much I could try? Mainly it's java ferns that are having the trouble, but it's also on crypts and hygrophila. I tested a java fern plant and a hygro stem with the bleach but haven't tested crypts since they're harder to remove from the tank.

 

Tried it three times, it did nothing other than create lots of bubbles on it for a little while.

If the bba dies, will it fall off? I'm wondering if the stuff that turned a lighter color is actually dead, but still stuck to the leaf.

 

No, it sure doesn't want to come off. However if it's not green anymore, it can't be doing photosynthesis anymore, can it?

 

I think the bleach is working. I soaked my java fern for 5 minutes and by the end of it, the algae was coming off in little chunks. I also tried a crypt for three minutes, if it survives I'll do the rest of my crypts too. My hygro isn't really that bad, I took out a couple of infested stems but otherwise I don't think I have to worry about it.