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I'm not sure I should be on the "beginners" forum since I've had a tank now for over 5 years.. but I still feel like a novice. There's so much I just still don't know. For instance, I find that the glass cover to my tank is constantly filthy. It seems to grow a hard crusty substance everytime I turn my back. The only way to remove it is to completely remove the entire top of the tank cover, separate all the components (glass from plastic), then use a new sharp razor blade to scrape the irritating substance away. Sometimes I think I see tiny moving objects along the edges.. like small organisms. So, I've started rinsing everything in a bleach solution (1/4 cup bleach to 1 gallon water), then a hot tap water rinse, then allow everything to dry on towels in the kitchen (usually over night .. as it's the only time I can be absolutely sure one of my three preschoolers won't get into anything). But, time and time again it starts to reappear after only a few weeks. It can't be hard water build up as I'm using only distilled water in my tank. And besides, hard water doesn't have living breathing MOVING parts. I have a 50 gallon freshwater with an Eheim filter system. The pet store suggested that I use a product by Kent Freshwater called R/O Right to restore the essential minerals to the water. We have a very serious evaporation problem (we're in the middle of a drought and water rationing) and I have to add another gallon of water about every three or four days just to keep the water level from dropping a half inch or so. Any ideas what this could possibly be and how I can prevent it?