I got a few 25 litre drums from a mate thats packed in with the aquarium. I prepare 2 a couple of days before the water change which allows the "tap safe" to take effect and the water temparature to raise so its not such a shock for the fish.
I then use a 3rd drum twice to enpty (this equates to 25%).
The drums are perfect for emptying but syphoning it back in seems a bit risky, balancing 25 litres on the corner of the tank.
My initial plan was to get a pump that would take the water from ground level up and over into the tank, but i'm not sure what would be the best to use. I thought about the drill powered pumps but the couple of sellers I have asked have both said thay are not powerfull enough. Mains operated are expensive and probably too powerfull. I did think about what ever is used for the extrenal filters but not having used an external filter I'm not sure what to look for.
Any ideas?
TIA