I'm new to the hobby and just purchased a 75 gallon from a girl who was moving. It was full of green algae when I got it, however I rinsed the rocks and cleaned it up pretty good. It has been set up at the new location for about 4 days and that algae is starting to come back strong. My water parameters are all fine, so whats next? Currently the tank has no "cleanup crew" except for a couple of sandworms. I don't think that there will be any real die off because I kept the rock in good clean saltwater while moving. Also, I made the mistake of using a playsand that contains silicates for most of my substrate, and used some of the stuff from the old one. Now I'm starting to see the brown algae (cyano?) on the rocks and powerheads. Do I need to cycle the tank or purchase some snails and crabs? Any advice would be greatly appreciated. I haven't been running my MH at all, just the actinics.