i used the siphon method with air line so i didn't take out to much water.
i went one step further and brushed of the rock with a small paint brush it would never come back in the same spot after it was brushed. tried the chemicals didn't work for long don't waste your money. took 3 weeks every second day of syphoning/brushing but it's gone now. also whatever rocks you can turn over and check it likes to hide and make sure the lights have been on for a while so it turns red.
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If it was easy it wouldn't be any fun.
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