Hi all, I have a BiOrb and I want to add a heater for my White Clouds and my Amano shrimp to keep the water at 25c, the issue is due to the curved side I imagine it'll be hard to get one to stick. The BiOrb heater has awful reviews so I want to get a different one that can possible lay on the bottom? Please reply as the water temperature will soon begin to drop due to colder weather. I know the White Clouds can endure cold water but the shrimp can't. Any recommendations greatly taken.