i had the same problems, algae and die off of corals. i had far better results with vodka dosing. i have since taken the pellets off line and things are turning around and colors are coming back.
i did some reading on reefcentral and found that alk plays a factor when using pellets. most are saying to keep your alk on the low side (around 7.0 to 7.5). to me its not worth the risk to try them again.
the same was said on RC, worked great for some people and poorly for others.
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