"Not good for sps tanks"The best ATOs have 1% salinity variation on this size sump with no baffle. Most "good" ATOs vary 2% and under failure conditions more like 3-5% (ie main float/optical worked then failed the next cycle so the backup float/optical switch or valve caught it). Not good for SPS tanks.
That make no sense. My 120 no baffle sump with Tunze ato and 10g bashsea.
I ran this from frags to full sps before I took it down after 34 months. My evaporation was 2g's a day. Check my build thread.