I have a 29 gallon Biocube that I drilled and have a sump in the stand. The total water volume is 40 to 45 gallons. I have a very old Euro Reef skimmer that is rated for 90 gallons in the sump. The skimmer has never done well on this set up, but for the last few months it has been hardly pulling any skim mate at all. I'm looking to buy an in sump skimmer that is rated for my size set up. I'm looking for suggestions for a good skimmer. Any help is appreciated. Thanks