Thanks Supasi and A-town That is very helpful information that you have both provided me with
So I'm getting my tank ordered on Monday hopefully. After a talk with mum the dimentions have been changed to 75x55x50cm, because if I used my other dimentions I would have to also look for a stand, but I have a good table that I can use for the tank, but it is too small for a 90x60x65cm tank.
I already know about the pH thing I have 10x Terminalia cattapa tea bags, plus I will go to Mitre 10 Mega to buy some Sphagnum Peat Moss for the substrate. I can collect rainwater too. I love blackwater tanks In autumn I can collect oak leaves from the park. Plus I still have a few from last year.
How do you set up a good-sized blackworm culture Simon? (I don't want something too small that might run out quickly if I have lots of hungry mouths to feed )