i bought a heater and to my supprise there is no numbers on it only a a plus and minus ☹️ i dont know if i should get a new one that i know will be at the right temp or just keep it and try out and make it right with the thermometer
the bigger ones i got from pet smart (Anubis) and the Anubis nana and vallstara i got from lfs, they were emerged at lfs not at pet smart tho. is there anything i can do to fix them.
how long have you had these fish, did you just buy them? if so maybe they are not use to the food and they might have had different water parameters.
just throwing some ideas out there