I have a juwel 260L tank with a tunze 9004 skimmer, it has been running for months and works fine apart from constant micro bubbles. It feels like there is a tiny sweet spot with water level for it to work without creating bubbles. As I have no auto top off it is extremely annoying and I am looking to ditch it in favor of a better in tank skimmer! Can anyone recommend a good in tank skimmer? Thanks in advance!