There hasn't been much to fiddle with recently, things seem to be moving along pretty well. I did finally set up an auto waterchange system though. Through the wall the basement is unfinished with a floor drain that the furnace and RO system uses, so it's a perfect spot. I picked up the neptune DOS and a 44g brute with ESV salt mix. Everything seems to be working well for the AWC, it's pulling out 4L a day, so that 44g brute should last well over a month before refilling. I don't have a float valve in the brute yet, I really doubt I will forget to check it, but it's on my "think about" list. I just don't want to add a break out box on the apex for it. I do have a gripe with ESV salt. Clearly being an expensive brand people are going to use it for full strength seawater, or at least 1.025. I used the 50 gallon formula for the brute can with 40g in it and it mixed right at 35ppt. Seems kind of shady to me that their 200g mix really only makes 160g at 35ppt. $110 pretty spendy stuff for only making 160g, almost a buck 50 a gallon. I might just switch to another salt mix when this batch is gone. I don't know if spending $1.45 a day in salt is worth it for only a 120g tank.