There definetly cheap and they are very finicky. If you adjust them for water level they will run fine then they will start over flowing . The best way to run them is as a in sump model so if they over flow it just ends up going back into the sump. The 65 version has a small air intake and gets clogged quit easily with calcium. The 125 is a little bit better but has the same overflow problems. If you are going to buy one I would go for the biggest one you can afford. But in that case you might as well get a good skimmer. Allso if you are going to get a bigger tank later it's probably better to get a larger skimmer that you can use on that system. it will save you money in the long run.
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