Substrate in hospital tank

[Bob I]

I realise the statement "sick and tired" is too strong for most people's sensibilities. It found its way into the post after testing a certain amount of wine to see if it was aged enough. The well aged tank, and the fact I never introduce store water into my syastems have worked well for me. I would also urge people who have disease problems to read this.
http://reefkeeping.com/issues/2004-01/eb/index.htm

In particular Myth #15. The whole series is well worth reading.