Its best to have a heater to maintain a steady temp. Some fish may be stressed by this but not all. Id be mostly worried about your Neons. You also have to keep in mind that most of these fish are not wild caught and therefore dont like exactly how they would in the wild. Things may bother them now that wouldnt in the wild.
__________________ 30G ~ Equipment: Emporer 400, Hydor 1, All Glass 100W Heater Inhabitants: 7 Pristella Tetras, 4 Assorted Danios & 2 Cardinal Tetras & Blue Crayfish (M) 44G ~ Equipment: Rena Filstar XP3 & 200W Heater Inhabitants: 2 Koi Angels, Marigold Platy, Betta (F) & Blue Crayfish (F) 90G ~ Equipment: Tidepool & 300W Titanium Heater Inhabitants: 4 Texas Cichlids & Royal Pleco-L027C Other Pets ~ 2 Horses (Sassy-Sunny), 2 Rats (Duncan-Bongo) Dog (Chance), & Cat (Jersey) |