I have some PMDD premix but im kind of paranoid about using it cause Im horrible at figuring out how much to put in. I have c02, thats about it, and does flourish.
it happens in every aqaurium I have
30g standard with 90w flourescent over it
a 55 with 110 w CF over it
and a 10 with 26 w CF over it
the guy at the local store uses a K additive and thats all, with like half RO water ( which is what I recently started doing (the 1/2 RO part))
so the lack of K sounds viable, I may try that .... but it just seems like somethings missing.. cause my stuff grows very slow as well..
this problem seems like the 1 obstacle left in having excellent planted aquariums like some of yours - lets see what I can do with your help =0