Skimmer question
I just bought an ASM Mini-G in-sump skimmer that I bought for my 92 gallon Oceanic (All Glass) reef tank. When I plug the skimmer in, it immediately fills the collection cup up (within 2 minutes). The water in the collection cup is crystal clear, as is the water in the aquarium.
I've tried adjusting the skimmer to raise and lower the water level, but it still fills the collection cup within 2-3 minutes.
The manager of the LFS where I bought the skimmer told me that it will fill the collection cup up once or twice before it starts to work properly, so I tried emptying the cup when it filled. After 30 minutes of emptying the cup every few minutes, I finally shut the skimmer off.
The water tests give the following readings:
amonio 0.0
nitrite 0.0
nitrate 20
salinity 25
phosphates 0.5
pH 8.4
My sump is an Oceanic (All-Glass) sump, with bio-balls, a sponge filter, and a return pump.
The water is crystal clear.
Any ideas why it's filling the cup up so quickly?