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Tried for a few months but too much water changes.Definitely internal (Tunze) – or maybe try without a skimmer.

What model?I also have the Aquamaxx hob skimmer On my JBJ 30 gal. and I really like it. I bought the one that comes with the sponge or micro bubble diffuser, it took a few days for it to "break in" but since then, no problems. I had purchased the Tunze 2004 and the hydor nano in tank skimmer and did not like either one. Hope this helps![]()
Right now Marine Depot has them on sale, Aqua maxx HOB-1 , good price right now, but also check Amazon prime to compare. ( not promoting any of the aboveWhat model?
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