Glad to help.
Have you been keeping up on nitrate tests? It should be rising between water changes - as a sign that ammonia is being processed all the way through the cycle.
Bettas and male guppies are a bad mix. There are a few people who have done it successfully, but I think they just have the more docile individuals. You'd be really rolling the dice. The bettas generally are very intolerant of fish with long flowing fins as they appear to be more "betta-like". Also, you want to avoid fin nippers with bettas, as they are very slow swimming and can't really defend themselves against those types of fish - like tiger barbs.