Do I need to keep qt running continuously? Or is it something that can be run only when needed, for instance new fish before they go in main tank? When setting up qt (I'm going to use my old 24g tank) no substrate, no rock is that right? Seems a bit cruel to a new fish to have nowhere to hide. In main dt with no fish in it I would still need to feed a bit plus have lights on for the corals yes? Sorry for the questions.
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The QT only needs to run when you need it.
I have 20g glass, small heater, an old aqua clear sponge filter and an old desk lamp.
You need nothing but one short PVC plastic pipe for hiding for each fish.
I never use any rock as it just traps crap, and would need months to cycle to a point where the small water in a QT could be a good filter
I never cycle my QT, takes way to long, this is a hospital tank
I simply change out 10% water each day and vacum up the bottom.
I understand the money issue. When your ready, make it cheap!
Yes for the DT, all remains normal except feeding, with no fish, keep it small.
If you maintain Nitrate 2-10ppm and phosphate 0.03-0.1, your fine.
Once your DT does 72 days, nothing ever goes in without QT, and this will avoid a ton of work. I personally don't QT corals but I do dip them for 10-15 minutes, brush them, inspect them. I do QT each and ever fish with exception to a Mandarin, which has a POD requirement, and would not make it through QT
With the lack of a QT, all you can do is feed well high protein foods.
Garlic is a myth, it does nothing but perhaps make the food taste better.
Good luck