well, now that i got a new computer and i've dealt with my internet connection issues, i will be able to update my thread more often.
i cant tell you how frustrating it was to make a simple post using a smart phone!
i started doing my tank service a little differently. i used to do my water changes on the schedule that everyone on this forum waxes poetic about: 30% every two weeks. i wasnt having any problems with this method, but i was checking out a book called 'the ultimate marine aquarium' (or something close to that) and maybe one person whose tank is featured in that book does bi-weekly water changes. most of the tanks that are in the book are SICK representations of what can be accomplished over time. some of the aquarist do their water changes 6 months apart! so i figured i would see what would happen to my chemistry if i waited a month.
i think a lot of this method depends on 1) the quality and types of filtration being used and 2) how much you are willing to dose non-conservative trace elements. i use I.O. reef crystals and theoretically, if water changes are done on a regular enough basis, there should be no need to dose anything. i realize that once a month is not often enough to get away with not dosing, but after the month of no water changes, my nitrates were only 5.0 ppm. i think this speaks volumes on the balance of my systems biological and mechanical filtration ( i dont use chemical) and also on my feeding regimen.
my water change process takes three days:
day one: i use my kati/ani unit to put roughly 30 gallons of water into a 33 gallon trash can. while i have the kati/ani hooked up i'll top-off my freshwater resevoir. the faucets in this house are cheap made-in-china pieces of dung, so it's impossible to match up the threads on the spigot to any adapter. so what i did was take it in to home depot and found some flexible vinyl tubing that fit snuggly around it. i use an adjustable hose clamp to hold it onto the faucet.
i use a hose adapter to connect the larger tubing to the tubing on my kati/ani
i use a mag 18 as a mixing pump to mix the reef crystals. i just eyeball it at this point, using one cup of salt for every two gallons of water. if i mix 30 gallons, i'll toss in 14 cups, so that way i'll have room for error. since i use cold water it takes the salt about a day to totally dissolve so i wont get a good reading right off the bat with my refractometer. once the water is mixed, i toss a filter bag of reef carbon in the sump and start a new batch of brine shrimp eggs in my hatchery.
day two: i will check the pH of the new salt water. these kati/ani units are great. they remove more TDS than a 5 stage RODI, and there's no waste water. i really like that i dont have to have water running constantly to keep up with my ATO resevoir and water changes. i just hook it up to my sink and check on the progress every now and then. i run the water through it real slow. the only downside to them is that, because of the chemicals they use to totally desalt the water, the pH drops real low. also, recharging the unit can be intimidating the first time. once you do it once, it only takes a few minutes to do it again. i use aquavitro "eight.four" to get the pH correct before doing the water change. on day two, i also add a few drops of zoe to the brine shrimp hatchery. i'll adjust the salinity of the new water. i'll also turn off the return pump and use a turkey baster to blanket feed reef plankton or mysis to the tank.
day three: i feed the baby brine to the corals in the same fashion i feed plankton and mysis. i'll wait about half an hour before siphoning the water from the tank into 5 gallon buckets. i'll take out the reef carbon and use the mag 18 to fill the tank back up.
the actual water change takes under 30 minutes.