Welcome to the forum.
Have you already got these fish or are you just planning them? Because if you have already got them, you've got major problems.
The first and most worrying thing that occurs to me is that a Golden Algae Eater (aka Chinese Algae Eater) is a very large, vicious fish totally unsuited to most communities. It will kill your bettas sooner or later.
Male bettas are not good community fish and bettas hate their own kind - even a mate. You need to get that male out of there ASAP. If you have already got a male better, put him on his own in a small tank - he'll be a lot happier.
The worrying thing about common plecos is the vast size they grow into and the huge amount of poop they produce. If you have one you have to be prepared to buy a large tank later on.
If this is a newly set up tank, you could probably do with having a read of my article - follow the link in my sig.