I have 24/7 change via HMA system ( Doesn't look quite as fancy as T1's) but it works good
I leave mine trickling into the tank all day and have had no issues with heating it at all. I have one heater in the tank coverd up by pipe so ray dont burn itsself and 2 in the sump.
The flow on my HMA filter can be turned up to a supposed 4/5 litres a minute if i remember correctly. Cartridges need replacing every 20000galon at a cost of about £40 , i change about 100 galon a day minimum so they'll last a wile. Best thing is i dont have to worry about tank maintence, the ray moves the crap off the bottom of the tank, either the external filter or the sump cleans the crap.
Brialliant really best thing i have in fish keeping

The flow on my HMA filter can be turned up to a supposed 4/5 litres a minute if i remember correctly. Cartridges need replacing every 20000galon at a cost of about £40 , i change about 100 galon a day minimum so they'll last a wile. Best thing is i dont have to worry about tank maintence, the ray moves the crap off the bottom of the tank, either the external filter or the sump cleans the crap.
Brialliant really best thing i have in fish keeping