What pump are you running, are you still trying this on a mag18?
I run a mag18 on my PM-1 bullet skimmer and it's a good combo. On my SPS tank (which is fed somewhat heavily) I pull out 2l of black-coffee consistency skimmate per week.
The PM-1 is a considerably smaller skimmer than what you're trying to run here.
I'm sorry but I think you need to make a decision, that skimmer has to go much much smaller, or you need a much much bigger pump. If you look at any of the larger beckett style skimmers, the usual recommendation is to go with at LEAST an Iwaki 70 or two Iwaki 70's, or an Iwaki 100. If you look at the specs for these pumps you are going to realize that this is a very expensive proposition. They use a lot of juice out of the wall.
If it was me, and this is just my opinion, but I'd step up to a Mak4 pump, and make the skimmer reaction chamber and injection tower no more than, say, 24" to 28" tall. Anything more than that and you are going to require multiple injectors and a stronger pump.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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