Hey, exploring options right now for a better fit for my sps tank. I swapped out my skimmer for one of the surf2's since I liked the simplicity of the UAS models but the air pump required to drive it sunk my ph to 7.7 during the day due to excessive co2. I've slowly got it fixed with one of the brs co2 scrubbers but that media burns out fast and isn't a cheap add on to maintain so looking into the waterfall models to hopefully reduce how much co2 is injected into the system. Currently I have a 100g sps display with a 40b sump (may actually be moving to DSM for a new job and using that as motivation to sell and move up to a 300dd but that's neither here nor there yet) so I'm thinking an L4 since it should be able to easily handle the current system and should be a decent workhorse if I get the opportunity to upgrade in the near future. I saw some posts from about a month ago about a new version that was getting ready to be out. Are those available? Also trying to figure out what the best option would be to mount it over the 40b sump in my stand.