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Do they usually stay at the top of the aquairm.

dont want to damage the tank

will it be ok to run a 200 watt and a 300 watt heater ,in a 240 litre tank with an external filter canister or will it be too much for the aquairm? I am unsure as to what to do ?

Hi all, My Jewel rio 240 litre has a 200 watt heater in it.Is this enough for the tank ? I am not going to use the filter that comes with it as it only pumps 600l/h. I have an external filter that is 1000l/h instead.will the 200watt heater be enough for this tank.It is a jewel heater. Would i be...

internal or external