I have used accuclear in a cherry shrimp tank with pond/ramshorn and MTS snails- no problems at all whatsoever and it worked perfectly to remove my GW. Go for it. If the green water comes back you have a problem with your water chemistry and we'll have to take additional steps, but sometimes its just a fluke or temporary change in your tap water, and will not come back. If this was just a temporary inconsitancy, you'll be fine. Forget the expensive equipment for now. Buying a $60 filter for GW is like killing a mosquito with a sledge hammer.