Hi Dionigi My apisto. died this morning. He was only breathing heavily before his death. I didn`t introduced any new fishes to the tank. The pair was in a 15 gallon breeding tank. They were cacatuoides (triple reds) which is super hard to find here in Montreal. Only had them for 4 months. Did managed to save 2 or 3 fry`s. If anyone has any for sell, let me know. Thanks for the info George