So I've been running the ecoBack pellets since around May (Almost 4 months) and Ive had pretty good success with them. Tank is clean, algae issue have subsided, and NO3 and PO4 levels are all looking really good: N03 1 - 2.5ppm and PO4 .015 - .02ppm I run about 600mL of pellets in a NextReef SMR1 Solid Media Reactor with a MaxiJet 1200 pump and have for the past 2.5 months with no real issues. About 3-4 days ago, I noticed the pellets started to really clumping up. Well now - they clump up and basically stop tumbling all together. I can go in a break the clump apart and within about 5-10 minutes the whole mass of pellets solidify with little channels of water running through them. I'm going to try a larger pump, but I'm not convinced that will solve the issue since the pump I have used to tumble them perfectly. My main question is - can the pellets get clogged with too much grown and eventually just stick together, and if so, do I need to take the pellets out clean them? Also - what are the possible ramifications if I don't keep them constantly tumbling? What should I watch for in my tank. As it is right now, ever few hours I go in there and break of the clump with a little magnet I installed buit that's getting supper annoying. Any advice you can provide would be helpful.