I have an eshopps psk-75h right now and I'm just not happy with it. Every time I do a water change it puts micro bubbles in the tank for hours and stresses everything out. It also seems like I am constantly adjusting it to skim correctly. I've also heard that if the power goes out it has a tendency to over flow. I don't know if anyone has this skimmer or can suggest a different one that works and is simple to use and set up. I have a 20 gallon mixed reef tank.