Review on 🐠 Betta, Bowl, and Aquarium Hydor Slim Heater by Randall Kelley

I installed a 1 gallon tank after adopting a family member's betta. I let the tank and heater run empty for several hours to make sure everything was fine and the 4w heater was working perfectly. Before adding the betta fish, I added a half inch of gravel and a center piece to give it a place to hide. After letting the fish acclimate in a small plastic cup, it seemed quite content to explore its new location (the old tank it was in before is getting cold due to the weather). Anyway, I woke up this morning to find the water cold. a lot of. It doesn't look like the smaller heater has enough power to heat a lot of gravel. I've removed the gravel around the heater and will start taking the temperature. You can probably use this behavior for a temperature adjustment. If you find the tank heating up, turn the heater down a bit. Don't splice with stars just because 4 watts is 4 watts and I half expected it.