First I have a Fish only live rock marine aquarium. 30 gallon. Ive got a fluval 304 canister filter and the prism skimmer. I bought this skimmer attachment because I wanted to remove the "scum" film from the top of the water. The item says it's a surface skimmer. I think that is stretching the definition of a surface skimmer. It draws water from the top inch of the aqauarium but it would be very difficult to get it to "skim" the surface all the time without constant adjustment. The problem is the height adjustment is mechanical. You have to move a lever and adjust the height of the surface skimmer, so after adjusting the surface skimmer to get a slight "waterfall effect" so that it is "skimming" the surface all is good until water evaporates and now not enough water is falling into the surface skimmer cup to keep up with the pump. I would have to top off the water in the tank and re adjust the surface skimmer cup everyday to get a true "Surface skim". I guess I will adjust it when I have time once a week to get the scum off the surface and then lower it the rest of the time so it will not starve itself of water when evaporation happens. It would be really nice if it had some type of flotation on it that would let the skimmer cup constantly adjust to the water level. It would be a 6 star if that was the case. Other than the adjustment issue. It seems to be built good and it fit onto the skimmer with no problem. I'm going to keep it and use it. I was not impressed with the options for surface skimmer intakes for the canister filter. They all stuck to the side of the aquarium with suction cups and well I have good luck with suction cups for about a week.
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