yeah, i had problems with ISO G, but once i actually got it started, it took off pretty well and then 2 months later i ended up having to stop making my phyto because of the tank build.... But i plan on getting back into it over the winter because i want to grow my own rotifers and ccopes and clams and what not, so i might setup a small factory of stuff in my house as automated as i possibly can. I was def producing way more than i used, so a lot of it got thrown in my garden, but i always wanted to make sure i had enough.
I'll ahve to find out about the cooler temps. I know that with ISO G, if you didnt have the temp just right, it wouldnt grow, even though it was within the range that advances aquarist had posted.