Ok thanks now there is some algae in that old hob should I just try to clean it out as much as possible and still use it?
As for the hob in my bow tank. One of the suggestions is to take the media from the sump of the display tank to put in in the hob of the qt. With no sump I can't do that. I would rather have a temporary qt so is this necessary or can I just take my dt water when I need it and run the hob of my qt with a fresh filter?
just clean it out and give it a vinegar bath.
regarding the qt if u have no sump but ur main tank is cycled and ready then u can place some ceramic media inside the main tank for 2 weeks and move them over to qt giving it a instant cycle. but i would still check for ammonia and add 1 fish for the first time a small one to make sure.
water from dt will not import bacteria.