I did a betta barrack using my 10g.
each rack is 5x5 a total of 6 rack with 5x10 in the back middle for filter and heater.
Things you will need:
Mark the 10g with a marker as shown on pic below.
remember each rack is 5" L by 5" W = 20" L by 10" W
the mark on the pic is wrong as you see there 4 mark.suppose to be only 3 mark.
Mark the Side, right down the middle
take 2 full sheet of plastic canvas, 2x report cover side. do as u see below
Note: you will have to play around with it till you get a nice fit.
also you will have to cut more report cover to fill the whole sheet.
Step 4: do the same as step 3 but this time on the side of the canvas.
sorry no pic as my phone went off already.
cut 6x 5x5 sheet of canvas, add report cover to the top,sides.
leave the bottom.
Note: you can use report cover on the bottom as you wish.
again you will have use ur own measurements. my cut work well for me.
install canvas to the middle, install the 6x sheet u cut out. everything will be held by sand or any other bed you use. No need for any type of glue or silicone.
you will end up with 4 in the front and 1 on each back side.
with 10" by 5" of left over space in the middle back side for filter and heater.
ill try to upload more pic later... show you how everything fit together.
any question just pm me or ask here.
below is a pic of my DIY 10g divider using only sand to hold it all in place.
no silicone or glue.
HA! dont mind the dirty water, i have to stick those thing in the tank which was already set up and running + some dirty went floating all over it.