You know, from what you're writing, I only see two things... one is the RO/DI water. Just from my personal experience it does a couple of things for me. 1. It eliminates any possibility of starting out with anything but pure water with pretty close to ZERO contaminants. Second, it gives you complete predictability with anything you want to add to your system. IE you don't have improper molecular binding and ionization by having phosphates or other reactive ions in the water. With RO/DI I have managed to acheive water chemistry stability and consistency... in my area at least.
The only other thing that jumps at me is the Hermit Crab and snail ratio... I keep probably 50 or 60 snails and 50 or 60 hermit crabs in my 200+ gallons of displays... even THEN I get algae that I have to harvest. I have Phosban too... but I also have loads of animals and feed them quite well. I think I'm going to pick up some more herbivorous creatures as well. The only other thing that may affect this would be your lighting, spectrum, photoperiod etc... algae is a battle we ALL fight at one time or another... anyone who hasn't hasn't had a reef tank for too long... 
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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