Face it young man, you need more tanks! If you got a double decker stand like this:
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You could put another 10 gallon tank on the bottom. It can be your angel grow out tank, because a shrimp tank is not compatible with growing angelfish babies. Nor bettas, as you have found.
I kind of think you know about the incompatibility issues in your tank, but you just hope for the best...it's much better to play it safe and stick with what is sensible. The cost of operating another 10 gallon tank is minimal, and a complete kit can be gotten at Walmart for less than $50. I like those Walmart kits with the twin incandescent sockets - a couple of daylight compact fluorescents will grow a wide range of plants![]()
I already have a whole 10G kit, but no room, I'll ask my 11 year old bro if he'll let me setup in his room