Originally Posted by trckrunrmike
How much of these ferts should I buy?
As you know, I'm new to this too (so if I write something wrong, someone please correct me!)
I just bought the following from Gregg Watson
(1 lb of each) which is a lot for a 20 gal tank, but since it's dry, it should keep quite a while and keep me going for ages, even if I get another tank. I'll just have to mix small batches in water before using.
1 CSM+B Plantex (traces)
1 Mono Potassium Phosphate
1 Potassium Sulfate
1 Potassium Nitrate
1 Calcium Chloride (only because I have really soft water. I meant to order Magnesium Sulfate (epsom salt) too but I guess I didn't.)
This totaled $30.17 including shipping, but according to fert part of Rex Grigg's
websight, it should come out to way less than 10 cents a week, so I've got at least a year's supply.
Greg Watson also sells a pre-mixed version of the various ferts I ordered (without Calcium Chloride) that looks simpler, and would allow you to purchace a single pound that includes almost everything. It doesn't have the exact mixes suggested by Rex Grigg or on the stickey, but it's close, and I'm not sure if it matters. I bought everything seperately so I could have more flexibility with dosing.
I also decided to buy phosphate and nitrate tests online ($5.49 and $9.99 not including shipping) so I could see the effects of what I was dosing. It's more for the learning experience but also to conserve some ferts by being more precise with my dosing.
Hope that helps!