To get rid of my bryopsis/GHA/cyano,when a bunch of snails died I used a tooth brush with a 3/8 airline, rubber banded to the toothbrush with the Tip of the air line pushed down in the middle of the brissles, half way on the head of it, start your syphoning, and slowly scrub inch by inch, it's amazing how much you will get out, it will help suck out the nutrients the bryopsis has sucked up,and the bryopsis when it grows back it's just sucking up more nutrients, then do it again and again if you have to, always replacing carbon everytime if not once between, it took me 4-5 times over a month or so, it's been a month or more and no bryopsis no gha, haven't had cyano since the beginning but worked well for everything...