in my opinion you won’t be able to breed upside down cats and bumblebees both together in a 10g. Also, I assume you mean one of the South American microglanis types and not the Asian type which simply would not fit a 10g tank. (They could eat your corys too) .
Forget breeding Pictus if you don’t have access to hormone treatment.
Think you are doing the right thing putting many of the bigger cats in the larger tank and picking one type to try to breed in the smaller tank, providing they are a small fish.
to start with, pick something which has been bred before and breed them ( like Corys or bristlenose plecs). Then, having done that, move onto more challenging cats like the bumblebees, shadow cats or even banjo cats.
The more expensive plecs could give a good return but require a bit of outlay to start with which is why it’s good to start easy and get the basics in place and confidence first.