So I'm currently doing a variation of
this article, but for corals.
The idea being that people are having decent success with all varieties of corals in pico tanks, so why not apply that idea to a QT system. In a nutshell, I keep my corals in 3 or 5 litre containers with lids and an air pipe down the middle. The lids keep evaporation to a minimum, while the air does gas exchange and flow. All containers are placed in a larger tub of water that has a heater, and a small powerhead to keep all of the containers heated to the proper temp. I also keep keep the next batch of water for a 100% wc in the same tub, so that the temp is exactly the same. When it's time to do a WC I simply, in the case of corals, lift out the egg crate, and place it in the next container. If I need to flush anything I can do it at that time.
The amount of time between WC for coral only can vary, but never more than 24 hours after a feed. I've stretched it out a bit, but algae can be a problem. You can generally feed as much as you want, which is great if you're trying to revive a coral. As for matching parameters, the simpler the better. I mix IORC to 1.025 and call it a day. I'll add Stability and Prime if I think something is likely to produce ammonia. Dying corals from the LFS etc. And do a water swap every day.
I spend less than 2 - 10 min dealing with water mixing each day. I could pre mix larger quantities of water at a time, but don't have the storage. I try to always add any medications or water conditioners as close to use time as possible, since some like Prime have time limits on them. Also, because of the small sizes involved, I get to use incredibly small doses of things. So I'm not spending much money on water, salt, or medications. 1 drop of Prime per Liter for example. .625 ml of stability for 5L. 100% WC everyday for a week uses less than 8 gallons.
As for lighting, I have a RapidLED par38 bulb on a gooseneck that I can raise or lower to adjust the amount of light. I can also move a container closer or further away from the light, or dim it depending on light needs an acclimation time.
Some corals in QT, next to an african cichlid also in QT. Prepared new water behind them.
bayer dip time:
I can isolate corals and fish, keep different varieties, group them together. I QT freshwater fish and coral at the same time. Whatever works. There's a huge amount of flexibility in this system. When I don't have anything in QT, the whole system gets put away, and my spouse gets their laundry room back.
dripping in 10 fish, 2 per container. 1"/L
Sorry for the long post.