I used to have the R-100 sump on my old 60g cube, used that gravity feed topoff valve for a couple of years.
Bought Eshopps 5g reservoir for it... yeah, it's more expensive, but it worked out well for me.
Today, I've got a 140... still using that reservoir. Added a controller based solenoid system to refill the reservoir every few days, and a Tunze ATO to get from the reservoir to the sump, but I'm still happy with the Eshopps reservoir.
A pick of the old sump setup for the 60g cube...
Bought Eshopps 5g reservoir for it... yeah, it's more expensive, but it worked out well for me.
Today, I've got a 140... still using that reservoir. Added a controller based solenoid system to refill the reservoir every few days, and a Tunze ATO to get from the reservoir to the sump, but I'm still happy with the Eshopps reservoir.
A pick of the old sump setup for the 60g cube...