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I use the biocube skimmer on my 14g Biocube, it's not to expensive and it works pretty well. I don't have any problem with micro bubbles or anything else.
I have a bio cube 29 gallon also this is the skimmer I have had 4 years and it works great still it was a tuff fit in the back slot tho and I modified it a bit
I also bought the skimmer for the cube originally it fits well but never worked well. It uses a air stone which needs replaced at times here's another pic of the aquatic life