Ideas on how to split 20gal tall?

I have 2 betta I would like to put into a 20gal tall split in half.
I have never split a tank before so looking for some firsthand knowledge.
I see the plastic dividers for sale in black with little holes. I worry my betta will still see eachother and flare up. They can see me from across room, they arnt dumb.
Other option I'm leaning to is a thick filter foam. You can get different thicknesses and coarseness.
Or any other ideas would be considered.

 

I have 2 betta I would like to put into a 20gal tall split in half.
I have never split a tank before so looking for some firsthand knowledge.
I see the plastic dividers for sale in black with little holes. I worry my betta will still see eachother and flare up. They can see me from across room, they arnt dumb.
Other option I'm leaning to is a thick filter foam. You can get different thicknesses and coarseness.
Or any other ideas would be considered.

there are solid partitions also, the little holes are so water flow can pass through. If you do use a solid partition witht he tiny holes, you'll need filtration aeration on both sides. Something like this they just really shoudln't see each other but the flow between sides is going to be bad for the tank circulation.

https://www.amazon.com/Lifewithpets-Gallon-Divider-Check-Compatible/dp/B082DLYSKG

water will pass through and stay balanced from side to side, but it's just not ideal for water circulation. 2 small sponge filters would do the job though and provide independent circulation for each side. A copule of the little HOB filters would work also.

theres also totally solid black acrylic / plexiglass and you can silicone it in place for semi-permanent separation and totally independent sides with no crossover at all.
the bigger the holes in the divider the better circulation between the sides.

you'd measure the inside dimensions of the tank from front to back and then bottom to rim edge for an exact fit either way you want to do it, not all tanks are exactly the same dimensions internally. they are generally built to fit stands and lids universally with the inside dims being kind of variable to an extent depending on the thickness of the glass used. .

 

I have a tank divider that is a solid sheet of plastic cut to the exact width of my aquarium that mounts using suckers made for the job likely those in this link. Of course there is a small gap and it is not water proof. A small amount of water can pass from one side to the other. Now here is the issue. Any time you remove even one cup of water from one side there is pressure on the suckers. Doing a water change is very very difficult and time consuming trying to remove the same amount of water from each side at the same time is almost impossible.
The idea is not practical at all . You need enough holes so you can remove water from one side and let it drain down without pushing the wall over.

Take my word for it it’s not a good idea. The suckers will not be a reliable way to provide a safe divider .

I had Ciclids on one side with their fry and the rest of the group of Ciclids on the other.

HingoFuni MiDube Fish Tank Divider Aquarium Acrylic Isolation Grid Board Divider with Suction Cups Accessories Transparent Plate Baffle Blocking Fish Partition Net Freshwater Ornament 25x30cm

Regardless of seeing each other they will smell each other in the same water.

A better shot of the API suckers with room for a 6 mm / 1/4 inch sheet.

Aquarium Divider Clip Glass Separation Suction Cup Fish Tank Partition Home | eBay

 

Agreeing with Flyfisha that the idea sounds impractical, and wanted to add: a 20 high doesn't sound like the ideal shape for 1 Betta, much less 2. Beyond the stress caused by constantly smelling each other in the vicinity, if you intend to keep fancy breeds, a tall just isn't the right shape. Bettas need regular surface access to breath, and longfinned varieties will tire themselves out very quickly swimming to the top. Long/low tanks are better suited to their needs, and in almost all cases, 1 betta per tank is a must. As others have mentioned, dividers are more suitable to protecting fry than to meaningfully separating aggressive fish.

I strongly recommend reconsidering your stocking plan. It sounds like you already have the bettas, is there anything wrong with their current setup?

 

Agreeing with Flyfisha that the idea sounds impractical, and wanted to add: a 20 high doesn't sound like the ideal shape for 1 Betta, much less 2. Beyond the stress caused by constantly smelling each other in the vicinity, if you intend to keep fancy breeds, a tall just isn't the right shape. Bettas need regular surface access to breath, and longfinned varieties will tire themselves out very quickly swimming to the top. Long/low tanks are better suited to their needs, and in almost all cases, 1 betta per tank is a must. As others have mentioned, dividers are more suitable to protecting fry than to meaningfully separating aggressive fish.

I strongly recommend reconsidering your stocking plan. It sounds like you already have the bettas, is there anything wrong with their current setup?

I am wanting to make one of their tanks a shrimp tank. Thanks all for imput. I didn't consider the hormones they can smell. I'll probably just get 2 more 10gal tanks for them. They are in 2 20gals I want to put shrimp in.

 

Here is the first 10 gallon life long tank for first betta. Thanks again all for inside