I'm a biggener, day 3 of my Aquarium. the pet shop guy gave me an antI fungal drop to be put into the tank. I guess I dropped more than needed which turned the tank water BLUE. now I replaced 60% of that with fresh, normal water. still it is a bit blue...and the pet shop guy says it will be taken care by the filter. my question is, will a filter really do that? what can I do to make the water look more clear?