I ordered 2 of these before I knew I was getting the 140 US Gallon Acrylic tank. I was going to use one on my 55G glass and one on my 60G glass, but I have taken down the 55 and initially thought I would use it on my 140 acrylic tank, but as I am cleaning it to put it in the tank I have had a "change of heart". I am worried this will scratch the acrylic.

Does anyone have any experience on using floating magnets on Acrylic tanks?

I very much doubt they will scratch the acrylic on your tank, they are made in a way that they will not do this. The only magnetic scrapers that you've got to be careful of are the ones that have a blade in them.

I received an algae scraper just this morning, it is made by Fish r Fun. It is the largest one I could find and will do up to 16 mm thick glass, boy has it got some strong magnets.

It is like this one, but much larger

www.amazon.co.uk/Fish-Fun-Floating-Magne...f=pd_sxp_grid_pt_0_1

thanks for the feedback Penn.

I have tried to google this issue also, and from what I have found it should be fine as long as no sand/ or small gravel gets stuck in between the magnet and the inside of glass.

I just am trying to be extra cautious with my acrylic because i know it can scratch easily.

Thanks again!