try upping the co2 a bit a watch them come up to surface for air in ten twenty mins., this method recommended by lfs in jkt. bcos theirs is a ten footer.
personally if decide to try this you have to pay extra attention because this way stresses the fish... you have to scoop fishies immediately... or else if you forgot a lot of them will croak... my xp... 
there's the malachite green from sera[omnisan]. claim it doesn't harm plants but you need to up the temp to thirty-thirty two which your plants have to tolerate for 3 days.
personally your choice, depending on how bad ich problem is...
You can if you dare to fail - Stan Chung
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