I have two bettas- An adult and a juvenile. We all know that two male bettas are to never be put together! but what are your thoughts about divided tanks? I have always been told that they stress this fish out and that the fish don't live as long as they normally would. Then others say if one of the fish happens to get sick, the illness may pass through the water. So, what are your thoughts? I would eventually like to be able to use one if they are deemed safe enough
It depends on the individual fish, really. Some hate being in divided tanks, others seem to not even know they have a neighbor. I wouldn't divide anything smaller than a 5g, so it also depends on what tank you have already/are planning to buy.
Diseases will potentially spread easier, and there is the chance that they will get through/over the dividers to fight, which is why people recommend using two dividers instead of one. That way you get a "no man's land" in the middle if one divider fails, and it's a great place to put the heater and filter so both sides are equal.
On the plus side, you have a larger tank surface so it's easier to cycle, you only need to clean one tank instead of several, and you only need equipment/decor for one tank.
I have a divided tank and there was one mishap when I first filled it. I made it slightly too high in the waterline and kaida got into kenta's side. oddly enough they just stared at each other in shock, didnt even flare. it was as if the concept of a fish being in 'their' side was so foreign they didn't know what to do. I of course scooped him out before they could make any more decisions about the matter and lowered the waterline. hasn't been a problem since. Its one I made from a plastic craft mesh and has nowhere they can dig or shimmy past.
I wouldn't want to separate these two if I could to be honest. When Kaida gets sick (often) and I have to swap him out they both get very depressed and lethargic. They live to chat.