1. Why are you letting the tank sit for the couple of days? Are you looking to do a fishless cycle? There is no need to let a tank sit - you can fill it, run everything to make sure everything works properly for like a day (filter, heater, etc.) and then begin cycling
Originally Posted by Vreugy
2. Your pH seems fine - your water parameters are supposed to be all 0 - you haven't added any ammonia yet to grow bacteria.
3. rinsing test tubes in water is fine before storing - they don't need to be cleaned with vinegar
46 gal fw tank with black skirt tetras, neon tetras, spotted corys, green corys, 1 guppy, cherry barbs, otoclinus, snails & 4 amano shrimp - plastic & live plants
5 gal QT with green corys & 2 guppies