I built a homemade skimmer earlier this year that was doing a pretty good
job of pulling junk out of the water.  But recently I did an overhaul on my
system (took out a 55 gal tank with a deep sand bed that was linked to my
125 and bought a 100 gal rubbermaid stock tank and added a 20 gal refugium
with a light dusting of sand and calurpa)  Anyhow when i did this I added
about a 100 gallons of fresh made water.  Since then the skimmer is pulling
very little.   The skimmers riser tube is 2 in pvc and i was thinking that
now with less to pull out of the tank after the big water change that 2
incheds is too wide and any foam is breaking down in the tube.   The riser
is coated in a thick green slime within 2 or 3 days after cleaning it but
very little is getting into the collection cup.  I was thinking of trying to
cut the riser down to 1 & 1/2 or even 1 inch pvc.  does anyone have any
ideas about this or am I wasting the effort to un hook the skimmer and cut
and re-glue the thing.  I just don't want to have a build up of nutrients
before it starts pulling out gunk again.

thanks
Ben

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