My betta has developed some kind of tumor that is attached to his belly. Extremely bloated, but still responds to us and has no labored breathing. It looks like a bubble with red stuff in it . Ever see or hear of that?
This is just my opinion with most not all fish shops...but I think they give bad info because they want to sell you something and don't care if the fish dies or gets sick because when they do you will be back for more fish or medications....kinda sad IMO.....
Anyway-what size tank are the Endlers in-this can make a bigger difference in growth rate-tank size and water changes...bigger the tank and the more water changes the faster/bigger the fry will grow, as far as food, any of the quality flake type foods that contain both meat and veggies especially Spirulina, also BBS are good for growth and development of fry.