Red sea 250 ato upgrade

[Parent_usmc]

Hey all! I would love to upgrade my ato box to something around 10 gallons, has anyone purchased one that fits inside the rsr250 cabinet? That they would recommend

 

[Tastee]

I run a Neptune ATK to refill my RSR 250 stock ATO once a day from my remote RODI reservoir. I use the spare ports in the FMM for a low and high level sump sensor. I like the 24x7 nature of the gravity fed ATO and the auto refill means I never have to touch it. The low level sump sensor alerts me if the ATO float valve gums up and needs cleaning.