IN a QT, the UV is often very effective in reducing the incidents of bacterial infection so it is very useful.
I will never start a QT without proper UV setup.
A protein skimmer in QT is worthless.
:headwally:
I'll jump back in since the OP wanted to know what else he should do to make his 20 gallon QT successful - I think this illustrates my concern. I'm not knocking wooden_reefer - or anyone else and I'm not arguing either for OR against QT - but this is what I think makes (at least for me, if not the OP) things so difficult to properly do a QT. This may sound like a rant -
it isn't. It is the reality that a newbie faces when trying to do the right thing.. I'm just trying to point out the bewildering information out there that can lead to failure in a QT.
I've never heard of a skimmer in a QT, but then MY way obviously didn't work well. UV or don't UV... why would you UV if your doing prophylactic treatment - for that matter, I've heard not to do prophylactic treatment because it stresses the fish - so maybe that is when you UV.
I've heard to keep nitrates at near zero to avoid stressing the fish and exacerbating any condition that it could be having. I've heard don't worry about nitrates and just focus on ammonia. (how do I get nitrates if I don't have ammonia?)
I've heard feed heavily so that the fish can recover and gain weight from shipping. I've heard to feed sparingly because you don't have a clean up crew, skimmer and LR to help filter.
I've heard to do one fish at a time ONLY. I've heard two or three are fine (but I don't really see how that is a QT then).
I've heard never medicate in the QT... that is a separate hospital tank. I've heard I always medicate in the QT. I've heard DONT medicate unless the fish is sick, I've heard assume the fish is sick and medicate.
I've heard use AmQuel - and as I've found out - it can kill fish, suck out oxygen, and generally make your ammonia readings all whacked out.
I've heard to do large water changes daily to compensate for no filtration and I've heard to keep water changes minimal because changes in temp, salinity pH etc. can cause fish to weaken and die.
I've heard to do a pseudo-hypo to reduce the chance of ich and it is easier on a fish. I've heard don't hypo unless you have a copper sensitive fish. I've heard hypo doesn't to ANYTHING unless it is at 1.009 - at which point you really have to buffer your pH. Which again complicates things because now you're mixing water for two different tank salinities.
I've heard 10 weeks disease free is minimum to break the ich life cycle... which means take a year to stock a tank - likely with fish that total an investment for the average hobbies of less than $200.00 at a cost of running one (or two if you use a hospital tank) tank for an extra year (water changes, heater, pumps, etc.) I've heard that 3 weeks is enough to ensure the fish is healthy.... I've heard that a week or less to observe that the fish is eating is sufficient.
I've heard you have to QT coral and inverts so they don't add tomonts from their water to the DT. Iv'e heard you need a separate QT for inverts which means now you're at a QT, a hospital tank and a separate tank to QT your snails, shrimp, corals, AND a DT - gosh, now my living room is getting really crowded. I'm also doing water tests on four tanks, plus water changes and diagnosing, medicating and dipping if anything goes wrong (when do I go to work?).
I've heard that the tank has to be the size that your fish will require for their final home (roughly same as DT), I've heard that 20 gallons for 6 weeks won't kill a tang (unsure on the size of that Tang and I tend the frown here, but eh - what do I know - right, I mean I killed a crap ton of fish in my QT and felt terribly responsible for screwing it up and the fish paid the price.)
Finally, I've heard QT stresses fish and ultimately only marginally reduces risk - so dump them in the perfectly balance water of your DT and hope that your good husbandry and pristine water stability will help the fish fight off whatever it might have (and the rest of the inhabitants too). I've heard that I'm an irresponsible lout that shouldn't be in the hobby because I haven't QT'd - believe it or not from people
that later admitted they don't QT because they can just watch a fish for 30 minutes and tell if it is sick.
I'm not trying to say anyone here on THIS thread doesn't know what they are talking about - BUT - for a new person (and even this 18 month old) this makes it extremely disheartening when things go quite wrong in the QT and they seek help. There are more than enough people willing to tell you that what you did was wrong - no matter WHO you chose to listen too.
Just sayin'.