This pump is great. I can shift its position on the glass (to simulate currents etc.) simply by moving the external magnet. It will not scratch your glass. I use this pump in a 48 inch 75 gallon salt tank (live rock fish only) and I get water movement from this pump on the opposite end. I also use a 13 year old Rio 2100 pump mounted on the opposite glass of this Seio P1000. Between two pumps I have more than enough water movement for my live rocks and especially my thighs. I'm really very happy. By the way, depending on the depth of your tanks and such, you may need an extension cord. Since I placed the Seio pump at the bottom, I needed it. Much luck!
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