I have had a male betta for about two months now. He's in a heated 10 gallon with a filter, and lots of silk and real plants. I'm considering getting pygmy corydoras catfish and african dwarf frogs. How many of each would be appropriate? Or how many of one or the other? I'd rather be closer to keeping the minimum rather than having a tank stocked to capacity. Also, will the betta be extra aggressive since it has been alone the whole time? He is very curious and active.