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Hi
Sorry your neons died. Where are you buying your fish?
If I were you, I'd get a credit from the store and wait a bit. Let the tank cycle with the betta since she's already in there.
If you wanted a danio, might be ok... not a long finned one- just the regular zebra- they'll survive the cycle but the thing to remember is, then you're stuck with him and he takes up valuable inches in the 10G (unless you want him)... means less fish you want in the future unless your fish store lets you trade him in.
Look up "fishless cycling" on google, there are tons of sites/instructions. You could put Bertha in a bowl for a while and do a fishless cycle using pure ammonia or fish food- much less cruel to the fish. Get a test kit and keep testing your water parameters... you want to see an ammonia spike, followed by ammonia dropping and nitrite spiking, followed by ammonia and nitrite at 0 and nitrate going up. Then you know the tank has cycled, and you can safely add fish.
Neons aren't hardy. If you do get them again, make sure you acclimatize them in the fish store bag- float the bag in your tank for 20 min or so to get the temperature evened out, then open the bag and take out some water (down the sink) and add some tank water to the bag... repeat every 5 min or so for 2-3 times... then catch the fish in a net and place in your tank. Don't put the fish store water in your tank.
There is so much to know about fish... I started with a 10g, got a 15g a few months ago, and today I bought a 46g. Watch out, it's addictive!!
Good luck
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