Day 2 update
Nothing exciting, just a 50% water change that took 25 minutes. Ordered a pump and hose, hopefully things speed up.
Also ordered some TNC Complete, looks easy enough to use.
You can get a python water changer, but it might be overkill on this tank size, maybe not.
I like TNC, there are others out there and everyone has their favourite; but it'll yield good results used sensibly