I have an extra Fluval EBI/FLORA tank which I use. Simply rinse before using, setup, cycle (I use media from the main tank, hanging a sponge in the main tank to seed helps) and the use. Once done, tear down, bleach clean, rinse and put away.
Make sure you use nets/etc only for the QT and not the main.
Have some more bad news to report. Just got back home from work and noticed that my sparkling gourami do not seem to be doing well. It's probably something the sundadanio brought with them. One of them appear to be particularly weak. I usually skip feeding every other day but I decided to give them food. Fortunately they were well enough to eat.
Decided to do an unplanned water change, seemed like a good idea since the gourami are clearly sick. They went into hiding shortly after that.
I've had these sparklers for about a year and I've grown very attached to them. It would really suck it I were to lose them but I probably deserve it. I'll be working from home tomorrow, so will be keeping an eye on them. I have some metro from Seachem on hand but that's about it... I have to work from home tomorrow but I might try and get a bottle of praziquantel or API General Cure tomorrow. There is a fish store that is pretty close to where I'm staying, not my favourite shop but it will work for last minute purchases like this.
Corydoras habrosus are active as always but will be monitoring them as well.
UPDATE: One of the gourami has died. The other appears to be fine, but will be difficult to observe it considering how shy they are. Corydoras appear to be doing fine as well. Will be monitoring the fish for the next couple of weeks. Probably will not be buying new fish for several months. Perhaps some shrimp in 2 weeks.
UPDATE 2: the remaining gourami has become painfully shy. I guess the loss of its tank mate has affected it quite badly. I can see that he's still alive and healthy. It's only the first day but if he continues behaving like this then I guess he just waste away eventually.
Rehoming probably won't be an option because I just lost fish so who knows what the survivor has got and frankly netting him is nigh impossible unless I remove all the hardscape. Getting more conspecifics isn't an option at the moment because I won't be able to QT it. I guess we'll see what happens in the next couple of days.