I used to get guppies from a canal behind my house and then like 3 of my fish died and they included a 12 inch rtc a 12 inch golden clown knife and a 10 inch pbass i thought this was because of internal parasites from the guppies i was feeding but recently i have been struggling to afford feeders and im seriously considering just getting the guppies from the canal again now the reason why i dont think it was because of the guppies now is because at the time i was feeding these guppies to two of my other tanks and no fish from any of these tanks died so idk what to do all i know is the guppies are FREE and it was a lot easier to feed my fish then.