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I just ordered a glass mag float and an acrylic magfloat. Ill let you know how i like it as soon as it comes in the mail!!! hopefully sooner than later.
i've heard of prblems with the acrylic one picking up smalbits of iron from the substrate and scrathing the walls. but i haven't personally experienced it. i use old fashioned elbow grease for the green spot algae (hey--it builds my biceps )
I've just started using the glass one and really like it. It works well. Of course manually scrubbing cleans faster but is definately not easier than the magfloat.
The big (about 8" long and 3½" wide) mag float that we use for the big acrylic display tank at my friend's shop is so strong that the two sides must have a block of wood between them when not in use....if they are put together, they are vitually impossible (literally) to pull apart. Costs about $200, too!
It is great for the algae that comes off easily, but I have had some problems getting spot algae off with it. Have to use a good old fashion scraper for that.
I just got my 2 magfloats in the mail today and they are great!!! I would imagine you have to be careful with the acrylic one because you could get gravel or sand cought in it.