Actually guano is usuable for hydroponic system. In fact guano tea is just powdered guano and water mixed together.


I'm not sure if you wanna try using just guano on your first grow, maybe some ph balanced nutes. If you wanna grow Organic but with hydro I highly reccomend trying out the Fox Farm Hydroponics nutrients.

Here's a site on guano:
http://www.canadianwholesalehydroponics.com/guana.cfm

here's a site with a good pH/EC/TDS/Temp wand for cheap. If you're doing hydro and wanna do it right this is probably one of the best things to get.

http://sunstoneherbals.com/hanna_com...er_hi98129.htm