If you are careful you won't put any noticeable scratches in an acrylic tank. We had one for almost a year and we never scratched it. However it was a huge PITA to clean the tank carefully.
We bought an acrylic magnet which worked great if you cleaned it everyday, and while cleaning you were careful enough to not get sand stuck in the magnet. However it was usually a few days to a week before we would get around to cleaning the tank. By then you would have to scrub it by hand with a filter floss pad, which worked very well, but took a lot of time and effort.
IMO much easier to clean a glass tank with a razor blade attached to a magfloat.
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One more fish should be ok?, right!!!  - Laurie
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