Just did a water change about 2 weeks ago and everything is fine I believe, but I have the little circular cloudy spots all over the glass. The thing is I have a pond snail problem are they making these spots???? Or is it from the cucumber slices I put In to catch them???? There's some cucumber shrapnel floating about, will the cucumber create bacteria in the tank???? I have also seen some very tiny white specs that are little swimming creatures ( not flat worms though) are they maybe ifusoria? which wouldn't be bad cause my danios are breeding right now ( I think ). Oh!! And will the pond snails eat my eggs or will the small white creatures???