Azurel, is the Red Sea your using the Coral Pro?
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I used Oceanic after I got a hold of a bad bag of Reef Crystals and got that same algae issues, this was shortly after it came out though. I know for a fact that it was the salt as I went back to using Reef Crystals and it went away and I never had the algae issues again. I can't say if I switched back that it would happen but I know I didn't have that slimy algae issue when I switched from the Reef Crystals, in fact I didn't have any algae before I switched only after......They might have gotten better about their quality control, I know a buddy of mine like Oceanic and never had any issues like I did.