Cutting acrylic is usually just scoring with a blade a few times, then breaking it off. It sounds "easy" but i always have a hard time with it. I have a dremel that i use to cut acrylic, but it tends to warp if you water is warm, unless its thicker acrylic.
Did a w/c today before the ammonia was at .5 now we wait. salinity is 1.024. I'm trying to make a lid for my pictope but it's not easy as it looks. Went to a hardware store they don't cut glass so I got a piece of acrylic and that tool to cut it but it's junk.