Hope this is okay to join in here. I just started a 125 fowlr and wanted evaluation and suggestions on my filtration. I thought this would work great but the bio filtration seems weak. I have a 35 gallon Eshopps WD-300 CS sump with, I think about 10 gallons of bio balls. I have 100 pounds of sand, about 50 pounds of live rock, a Coralife Super Skimmer 220, and added 2 liters of Pond Matrix to my sump almost 2 weeks ago. Shouldn't this be really good filtration? Is there something I'm missing or need to add? To make a long story short... If anything causes an amonia spike it's like I it goes through another mini-cycle. Forgot to mention that I added about 2 pounds of nitrate sponge about a week ago. I have a yellow tail damsel, an emerald crab that came in on the live rock (about 4 weeks ago) and a Calico crab. I don't think I'm over feeding but still... Shouldn't this handle a few pieces of left over food?