RO is good...RO/DI is way better!! There's a lot that RO doesn't take out and the DI will catch it in the final filtration process.
As for the Condis, I'd try and find a home for them. Their survival chances in this new of a tank are slim to none...AND they are just as likely to EAT your clowns as allow them to host. Keep in mind that these are Atlantic anemones and clowns are NOT Atlantic fish. Clowns never naturally host in Condis and Condis love to EAT fish...lol. They're pretty and cute when they're little and hosting a couple clowns but when they get big...and EAT your clowns, they aren't so cute anymore. They'll also eat your Goby...lol.
As you mentioned, slow WAY down. Take it slow, be patient and you'll have a much better reward than if you try and rush things.
You're experiencing a diatom bloom. As Krish said, we all go through it. I'm experiencing a small on in my newly set up 75 gallon and the live rock was not only cured but very well established already. Also, as Krish said, keep up on your water circulation. Keep it pretty strong. Also cut back on your lighting. (Another problem with already having an anemone in the tank.) When I set up my 29, I had a horrendous diatom bloom. I had nothing living in the tank...just sand and live rock. I got tired of looking at it while waiting for it to cycle. I finally turned the lights off for about 3 or 4 days. When I turned them back on....the tank was clear as a bell. No algae anywhere. Diatoms were gone. You won't be able to do that with an anemone in the tank. Let me know if you need some advice on plumbing the Mags. I've got a couple really good links from some people who REALLY know their stuff. One of them is a HOB closed loop system using a mag hanging off the back of the tank, drawing water out and then pushing it back in. There's a couple tricky plumbing things you need to know since Mags aren't self priming. You need to keep them primed at all times. It's really quite simple once you see these links. Let me know and I'll dig them up for you. Good luck and welcome to RF!!!
Michael