My two recently purchased male Bettas don't seem to like the usual compatible bottom feeding tankmates.
This all started when my female betta needed to be re-homed because she was eating too much of their tankmates food.
My set-up was one 10 Gal with the female, three cherry barbs and 5 NTs. The other 10 Gal was divided with two males (split 20/80). The CT was in the small section, the VT was in the big section with 4 albino corys.
I have my kids help with the feeding and they always had issues netting the female so she wouldn't pig out on the flakes for the barbs and NTs. So I moved her to the small divided section of the other tank after two of our NTs turned up dead. The CT went into her former tank. After about a month I realized the NTs were nibbling on the CTs tail and I put him in a 2 Gal QT.
When I went to the store to pick up some meds and food, I couldn't resist buying a DHM... I put him in his little cup into the tank with the barbs and remaining NTs for a day. The next day I released him and everything seemed fine. When I got up the next morning the three barbs were dead.
I put a divider in and had the three NTs on a 80 section and the DHM on the small section. At my next visit to Petco I consulted with the AQ rep and he mentioned getting some corys since my other tank set-up worked out so well.
Well... I added three Julie corys but didn't take out the divider right away. After three days they were all joined together and again the next morning two of the corys and one NT were dead.
The divider went back up and I went back to Petco. Replacing the lost corys and adding one more to have four (I just coudn't see that one guy being all alone). A friend took my two remaining NTs for her community tank. Since my daughter was with me, she talked me into getting a white male Delta Tail... he spent a day in the cup floating with the corys and then was released. It worked fine for a week and this morning the smallest cory was dead. The male is now back in a cup and I am ready to scream...
How long can I keep the Delta in the cup? I would like to keep the CT qt-ed for another week. After that I could move the Delta in the QT tank as his forever home and the CT can join the corys.
Any suggestions? I thought Bettas stay away from bottom feeders... Could it be the set-up? There are lots of live plants in that tank, sometimes I even have trouble finding the fish when they are in the back of the tank.