hmm so a possible zinc defficiency...

i have another question about water while we are on the topic, no matter how hot /cold the water is should i always let it adjust to the temperature in the room? i have been doing that and letting it sit for a couple days before using to evaporate the chlorine etc.

it makes sense that the "filter" may even be removing trace amounts of some of the possibly benificial minerals that may have been needed, so i will switch back to the tap.

so galvanized nails can provide zinc, any other simple solutions such as that?

i have a hydro shop nearby if ther are any products you can suggest i use to provide that little extra bit of zinc, if it contains other benificial nutrients as well that would be nice.