Freerider, you still with us??? Lots of good advice here but you don't have to get rid of your Fluval. Like someone else asked, what are you running for media inside it? I run one also on my 20 gallon but it's gutted. Bottom tray holds carbon, the rest is full of live rock. I had a massive cyano outbreak 2 summers ago and it was due to experimenting with tap water. Make sure the RO water you are getting is true RO. Everything came out of my tank and got scrubbed with salt water, filled with new RO water and I didn't have a problem again.
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