Very true. I would think a 300g display tank would have an auto-top off system.
I have played around a LOT with aut top off systems. And the conclusion that I have finally come to is that the system that works best for me is:
1. Get a sprinkler solenoid from the hardware store, install on tap that feeds RODI, use a splitter with valves if this is shared with a washer, as mine is.
2. Plug the sprinker solenoid into a timer
3. Wait a set period of time (say 1 day) and measure evaporation. Then turn on the timer and figure out how long the RODI takes to fill the sump back up to desired level. If the time is 3 hours, then set the timer for just shy of that
4. Evaporation changes a little with the seasons and changes to your setup, but now your tank fills up almost to what it evaporates per day. What I do is when I see the tank a little low, I just advance the timer so the RODI click on, and leave it. I have to advance the timer maybe once a week, and I don't have to worry about float valves failing or anything. And the sprinkler solenoid is close when there is no power to it.
Sometimes the simplest way is the best.... For redundancy you could setup 2 timers in case one fails.
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