For the years that I have kept fish I have always run external canister filters on a 14hr timer, from 7am till 9pm for example and off over night. Primarily to save on the electricity but it also give the fish a little rest 
Wether this is too long or too short a time I dont know but it has never done any harm to any of my tanks or fish. So the first question is how long do you run your filters?
The reason I start this topic is that I have just purchased a new 90g tank and for the first time ever a sump to go with it. The plan is to include my heaters in the sump to keep them out of sight. The problem here is that if i was to stick to my timer then when the pump is off the heaters are in effect off due to the heated water not being pumped up to the tank. So the question here is do I just keep the pump on 24/7, or maybe also run a very small low powered pump 24/7 with the main pump still on the timer. This would mean there would be a slow constant run of water overnight keeping the water warm but the main pump being off saving power and giving the fish their quiet rest.
Your thoughts please!!
Wether this is too long or too short a time I dont know but it has never done any harm to any of my tanks or fish. So the first question is how long do you run your filters?
The reason I start this topic is that I have just purchased a new 90g tank and for the first time ever a sump to go with it. The plan is to include my heaters in the sump to keep them out of sight. The problem here is that if i was to stick to my timer then when the pump is off the heaters are in effect off due to the heated water not being pumped up to the tank. So the question here is do I just keep the pump on 24/7, or maybe also run a very small low powered pump 24/7 with the main pump still on the timer. This would mean there would be a slow constant run of water overnight keeping the water warm but the main pump being off saving power and giving the fish their quiet rest.
Your thoughts please!!