Okay, I got a message about the dividers in the video and this is what it said:
yes the material is plexiglass bought from lowes.I use a metal straight edge and a razor to cut them. and "snap" them on the edge of a hard table to break easier. i used a 1/4" drill bit for the holes. i measured the inside of the tank for the dimensions and subtracted 1/8" to allow a little ease in installing. I used suction cups at the top on both sides to hold into place. no glues..........i havent had any scratches either. have patience when doing this, it can be a little bit of a pain and time consuming but worth it in the end i believe.
good luck, hope this helps
I'll be heading to Lowe's this weekend to look at supplies for this.