I have a 5 gallon tank with two shrimp and a snail, live plants for oxygen. The shrimp and snail eat the algae and I don't have to feed them. The tank has a natural cycle for the nitrates etc. The creatures are happy but my water is murky due to algae. How can I filter the algae out of the water itself yet leave the nitrate cycle alone and still have alae for the shrimp to eat? I just want to improve water clarity. TIA