Bought this for my 8 gallon biOrb. My heater fitted perfectly, but I couldn't properly attach it to the sides of the tank to get the heater closer to the top of the tank. I ended up just using one of the suction cups that came with my heater. Maybe it works better if you use a biOrb specific heater? I don't think this product is really necessary to add a heater to your biOrb.
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