I got some of this at the Cup, a friend gave me it to try.
http://ogtea.com/ (the veganic microbial tea). It says you can use it in hydro, you just need to run it through a filter first...I've used it as a top dressing to start with as I mainly just re-use my pot, no till, no change of soil, just stick a new plant on top.
Managed to pot up the last 4 clones....just got to veg them to 3 or 4 times the size now then flip it for reals...
these are roughly half dog, half deep blue (in no order at the minute, will seperate them into their relative halves when it comes to it...
Need to flip my flower cab pretty soon as well...pics to come at some point in the not so distant future.
Slainte, DST