Hello and Welcome to Fish Lore! Glad you came aboard! Personally I think your tank (love the galleon by the way!) is fully stocked. Pleco's are huge waste producers and depending on what type you have they can grow up to 18" or more. If the one's you have are common Pleco's I would consider returning them or giving them to a friend with a larger tank. This would give you room for some Endlers and possibly some Cory Cats for your bottom dwellers. (?)
I believe the ratio for male to female live bearers is 1 male to 3 females.
Best of luck to you and your fish whatever you decide. Thanks for sharing your tank with us. We love pictures around here. By all means keep us posted.
Have fun and enjoy the site!
Ken
