will definitley help with green water. You could also try putting Chemi-Pure in your filter, I've heard this clears up algae as well (cant personally vouch for this though). UV
should help with ich too, make sure you have it on maximum dwell and have enough microwattage for larger micron pests like bacteria and parasites.
drsfostersmith.com has turbotwist on sale for 69.99, or you can get a jebo if youre prepared to reseal the leaks you will probably get, but they run about 40.00. Once I got mine all sealed up it works ok.
And if you want to test for phosphate you can get a kit online, like drfostersmith or bigals
You may want to consider just getting a cheapo 5 or 10 gallon, or even just a rubbermaid container for a QT
. The only equip you need is a sponge filter, air pump and tubing, stability from seachem and a heater and like a fake plant or something for the fish to hide in. Nothing fancy. I think it would be worth it so you have an extra layer of protection for your main tank. It shouldnt be too stressful on them, just when youre transporting them keep them in the dark.