How many more fish can my aquarium hold and what kind?

ok so plecos need at least 55 gallons, loaches need 10 but dont get along with any of your existing tank residents. you could get some cory cats, danios, guppies, mollies, platies, or tetras but keep in mind that, danios, guppies and mollies need a school of at least 5 so i would pick only one type of those or maybe some corys mollies or platies. you have enough room to add about 5 more fish to your tank though. hope i was a help! good luck