sheepsnana borrowed one of my older books, can't remember the title, but its one of the best I've found, the older ones (circa 1960's) are great as they tell you how to DIY most things, one of them I had had a comment to the effect that commercial tanks are untrustworthy and you should make your own, then went into how to make a steel framed tank using rubberized window putty.
also little gems like using weaving cane as cheap airstones, how to use a small tube to remove hard to get at fish waste, blowing your own glass pippettes etc...