No, I have not kept many B splendens. I has one that belongs to my son in a 10 gallon which has always been housed alone (unless you count the pond snails!) because I am aware that this particular species of fish is known to be aggressive and I have never wanted to breed them.
I spend enough time deal with the end result of over breeding in dogs to go do it with fish ;)
Originally Posted by ChoclateBetta
I do not think the OP is keeping wild Betta. The OP probably does not even have access.
I most certainly could get wild B splendens if I wished, as my LFS has very good suppliers who are always on the look out for the more unusual fish, and I don't mind waiting as long as it takes to get the right fish.
My concern with either wild splendens or B imbellis is as previously mentioned by LittleBettaFish it is difficult to be sure you are buying a pure strain and not a hybrid.
If you end up with hybrids, the aggression levels may well be no different to keeping a group of B splendens.
I asked the original question after a chat with the shop owners son,who I know does breed many of he B splendens on sale. So it was interesting to learn hat may play a part in happy bachelor groupings.
Thankyou to those who have offered assistance :)