I am setting up a red sea 170. I bought it used and it came with a red octopus 110 int classic. I had it set up for almost a week and it was working great. Then I added the caribsea life rock tree and the skimmer is overflowing like mad and I cant slow it down. I opened the drain valve all the way and even lifter the skimmer up till it was almost out of the water. No difference. The water level is low but the bubbles are just crazy. I did a 20% water change no difference. Any suggestions?