The basic setup looks good, it's quite classy (I'm not a fan of some of the multicolored, many fonts sites - they're hard to read). The black is a little dark, but it's easy to read what you have written. I like that you have areas for discussion and posting DIY projects. Makes it seem like a friendlier, more helpful place.
I'd appreciate further descriptions when you actually get things in, like how much the measuring chamber for the fert bottle can hold and if there are other amounts indicated on the measuring chamber. The outside diameter and length of the dispensing syringe so I'd be able to tell if it would work with my bottles. The little details that can answer a lot of questions.