DIY tank dividers
Walmart carries #7 craft canvas in the craft department for under $1 for one sheet which is more than enough to divide a 10 gallon tank several times. It has holes so your water will flow through but they are small enough that the bettas won't be able to wiggle through them.
Then go to the school supplies dept and look for clear report covers that have the little plastic spines that slide down the side of the cover to hold the pages in. It's these little spines that you want. A package is around $1-$2.
Next, pet department for aquarium sealant. Cost about $3.
You glue the spines inside the tank with the aquarium sealant. (One of my guys here at work set mine up for me and he ran two lines of sealant right next to each other and then set the spine right in the middle. It worked great and has held for about two years now.) Let them set for a couple of days until the vinegary smell is completely gone.
Then cut your craft canvas to fit into the spines. Make sure you cut them big enough to make a tight fit. Then work the canvas down into the slits in the spines. It takes a little work to get them in the first time, but once you get them in it makes a great divider and shouldn't run you over about $5 total.
I also like that I can slip the canvas out in seconds when I want to do a complete tank cleaning.
If I can make these ANYBODY can!

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