Hi, and welcome to Tropical Fish Keeping forum.
Cichlids for a 25g are few and far between, but there are a few options. First though we need to know your water parameters out of the tap, meaning GH (general hardness), pH and KH (carbonate hardness, or Alkalinity). There would be no point in my suggesting dwarf cichlids requiring hard water if you have soft, or vice versa.
You can ascertain the above numbers from your municipal water supply folks, they may have a website. You don't need to spend money for a GH/KH test kit, as once you know these there will be no reason to test unless you go down the road of adjusting water parameters.