I am using the pellets and I am turning down the flow just enough so that they DON'T tumble. B from Skiptons suggested this. The thought was that the aggressive tumbling would release all the bacterial mulm into the system constantly, thus creating the same problem as overdosing vodka, i.e. cyano blooms.
Here's what I have found in my three months of using the pellets:
1) I can go more than a month without any detectable nitrates. I used to do a ~20% change every week, so I never had nitrates anyway. But usually by the second week of no water change the levels had risen significantly.
2) I cannot fairly say what this has done for phosphates, because I do not have a meter. First of all, I run GFO already so I never had an algae problem. I usually have to clean my glass 2x a week. I bought the pellets hoping that they would reduce this to 1x a week or less. Nothing has changed here. However, the pellets did give me the confidence to feed much more heavily than in the past. I feed one cube of mysis, one cube or spirulina, and one cube of coral food mix per day. This is significantly higher than what I was feeding before.
3) Water clarity is awesome and polyp extension is greater.
All in, I do not think these pellets are going to revolutionize the hobby as some really experienced people were predicting. They are certainly beneficial, but you have to decide whether or not the incremental benefits are worth the price. I will continue to use them though.
For reference:
I have a 30g tank with no sump. I run 150W 20K Ushio MH. I have a Sapphire Aquatics custom skimmer for the JBJ Nano Cube. I run BRS ROX Carbon and Pellet GFO in a BRS dual reactor, as well as the biopellets in a separate BRS single reactor. I have no mechanical filtration. I dose 2-part daily using a peristaltic pump. All controlled by DA RKL controller. Parameters are very, very stable. I also have a chiller.
Livestock:
Five Bar Mystery Wrasse
Yellow Coris Wrasse
McCosker's Flasher Wrasse
Firefish
Diamond Goby
Splendid Goby
Hi Fin Goby
Clownfish
2 pistol shrimp
Several Hermits
2 Turbo Snails
Mixed Corals, mostly SPS and LPS