I am looking to get amano shrimp and have been sending out questions to see what fish I could keep with them. I was told (on ask) that I could keep tetras. I know their tropical, so do they need a heater? Also, do they need anything special in the tank? Could I just put a heater in the coldwater tank I have? If I can't keep tetras without a heater, have you got any other suggestions of fish I could get with shrimp? I'm going to p@h today so I can look at prices and ask for advice. Ty so much! (I think tetras need a heater, I just wanna check)