This is a swordtail tetra (i think) in a 16g with 5 others, a betta, and 3 young apple snails. Tank parameters: temp 78, amm 0, trite 0, trate 15. Fed once daily with fasting on saturdays. I noticed today that this one fish has angry red lumps. It looks like they are under the skin, in the intestines, and at the base of the tail. What could this be? No other inhabitants are effected and the fish is eating and acting normally. Any guesses on what it is and how I should treat? Tank is lightly planted with java moss and java fern. Water change of 30% every 4 days. Tetras were qt'ed for about 4 weeks, then betta and apple snails were added. ????



