Hey guys been a long time reader but just signed up. Reading a lot about sexing the Vieja. Seems like the fish are making and clearing areas to lay eggs but both seem Male. There's a lot of discussion between correct species between vieja as well and would just like to clear some questions up.
Paratheraps melanarus (synspilum doesn't exist anymore). I can't tell which type the darker one is. Vent the fish to increase your chances of sexing the melanarus.