Perhaps something has recently been introduced to the market but I have never seem a hang on skimmer that was anywhere near as good as the majority of in-sump and external skimmers available. That is my main issue with sump-less. I'll admit I haven't gotten a good look at many Tunzes but their low popularity concerns me. The other is that without something like an overflow drain providing surface skimming an oily protein/bacterial film tends to form on the surface of the water. Oh and I hate power-heads. Absolutely hate looking at them in a display tank. At the moment a large return pump allows me avoid them, later it will be that return pump and a closed loop system.
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