brief background to this question is: (still) preparing for a red sea reefer nano tank, and am looking for ways to automate the tank and reduce the role of caretakers (i.e. wife or friends/neighbors) during work trips (typically 4-8 days at a time, sometimes more) as much as possible. the tank is anticipated to be mixed reef with some LPS/softies and a couple small fish, possibly an anemone. i have been gradually arriving at using an aquarium controller for comfort, and focusing on the profilux for this role. I had not really thought about getting an automatic doser, but since i will have to get an ATO anyways (given the unreliability of the RSR's ATO system) and since it would be nice to automate water changes, i have been also considering using a doser 2.1 to do daily water changes (probably ~1g/day) and act as the ATO, in addition to possibly dosing for alk or whatever i need (still have not decided on what water to use, as there is a LFS about 10 steps away from my home, and that might make obtaining smallish amounts of water from them on a regular basis an interesting option). does this seem like a wise move? the AWC load with around 1g/day does not seem to be too much, but i understand a doser isn't really designed for this over the long term, so looking for insight there. economically i'm also not so sure - would probably otherwise go for an osmolator and just do water changes and dosing manually, but if i could save the cost of the osmolator that might be better... the other question would be: more sensible to go for the P4 and the SA or save a few on the slave unit? not sure if the meagre savings on the slave makes it worthwhile to sacrifice the flexibility... thanks in advance!