Do her (and the fish) a HUGE favor and get an ATO, trust me on this one. I have a simple float sensor on the last chamber controlling a small powerhead in a 10 gallon tank next to the solana, its on the floor and I have a cheapo ikea lamp table over the top so it hides most of the top off tank. I fill it about every other week, I have never had an issue just keep the sensor clean, I check it once in a blue moon. This has worked awesome for me for the last 2 years.
If I do go with an external ATO, I will setup an AquaController Jr and a 5.5 gallon tank on the bottom shelf of the stand.
But it appears that using a Solana framed glass top (which is what we have) will reduce evaporation significantly.
We will start with no ATO and implement a manual top off as necessary. If evaporation is more than expected even with the glass top in place, then either I will do a cheap, DIY setup but most likely go straight to the Jr in order to realize other benefits with using a dedicated aquarium controller.




