I usually try to take good care of my fish, I have four neons and two algae eaters. I put the chems in once a week and try to keep the filter cleaned as needed but a few days ago it seemed like it went green overnight. I thought something had happened to the filter so I cleaned and changed the media in it. I put a little extra of the chems in in hopes that it would clear it up but so far it has shown no signs of clearing. It is a 15 gallon tank and have never had this problem before, I usually have to clean it off the sides and out of the rocks but I've never seen the water turn green like this before. Could it be a problem with my filter or my algae eaters just getting lazy?