How do i get rid of this?

you can get H2O2 from a chemist, it might be worth moving your fish to a bucket while you squirt it onto the algae.

I use it on potted plants before i sell them.

Spimds interesting.

How do you treat with H202? And how do you make the plants safe again after the treatment?

h2o2 isn't too stable in the presence of light, it quickly bereakes down to H2O and H2.

i take the plant out and sit on the concrete, i fiull the syringe with H2O2 and squirt it onto the base of the plant (the BGA is always on the gravel on the surface of the pot) and let it sit for bout 30sec then dump it back into the tank. H2O2 also seems to kill snail eggs, or atleast stop them from sticking.

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h2o2 isn't too stable in the presence of light, it quickly breaks down to H2O and H2.

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So as long as when I put the treated plant back into the tank and the light is on, there will be nothing to hurt the discus?

it shouldn't TW, mine never had, if your super worried give it a quick rinse under tap water