The reason you use the crafting mesh is for water/heat circulation.
That clear plastic shelf liner roll designed for shelves CAN be used but you will need to poke holes in the material for it to distribute the water EVENLY.
- Without the holes you'll have a ton of dead spots in the tank & that's NOT a good thing because certain sections will be dirtier than the rest due to lack of filtration & will require more maintenance/siphoning.
I've considered that shelf liner as well, but it's just too flimsy to make nice even holes out of without a PUNCHER. Easiest way to perforate that material is with a heavy duty hole puncher that should cost $5-$10.
The holes you punch into the material NEED to be smaller than a AAA battery.
- But the biggest concern is the flexibility of the shelf liners. A persistent betta will be able to get through that with enough attempts.
- Also one final thing I noticed about that material is that type of plastic turns WHITE & gets brittle when it's exposed to water for a long period of time. You may have to replace it every 6-12 months, but that's just a guess.
This product below I'm linking to is the stuff most people in this forum use to construct their own dividers, but keep in mind the price on this link is ONLINE only.
Fantastic price for a pack of 7 mesh though.
The mesh is also definitely available @ Michaels, but call ahead first & get one of the employees to verify the item is in stock before you make the trek.
Last time I stopped by Michaels, I wasn't prepared at ALL and totally forgot about what I was SUPPOSED to buy. I ended checking out all their glass/crystal vases & their silk plants & ended up walking out with a giant bird house instead of materials to construct a divider for my phishies.
The craft mesh is LESS work, but ONLY if you get the right size.
Don't forget the report binders for structure. (You will have to ask an employee to show you the section & BOX it comes in. 50 pack of report binders
Darice crafting mesh 13 1/4" x 22" is the one I bought @ Joann's
Katy..... nice gesture, but I think J needs more than 1 divider for a 20G long tank.