To address the OP's original question... No, there is not a way to avoid the uglies when establishing the tank using the method you chose. Diatoms will be the first of many pests you will need to manage. Adding cleanup crew members that help control the particular ugly pest haunting your tank can help. But really, you are the best cleanup crew. Get yourself a turkey baster, some bottle brushes, a denture toothbrush, and maybe a round brush used for dishes and blow/scrub away your problems repeatedly until they fail to return. Try not to start adding products that claim to eliminate one pest or another. They seldom work.