Definitely mix them up seperately, it allows you better control over the amounts of each fertilizer you dose so you can tweak the levels in your tank to just the right amount.
Since you're dosing KNO3 and KH2PO4 you probably won't need to dose and KCl or K2SO4. The first two will provide ample K unless you have a very heavy fish load.
For the micros, follow the instructions on the bottle. Tom Barr sais that he doses much heavier on traces than most and gets no algae. Chuck Gadd suggests that hair algae is from an excess of iron. I'm siding with Tom Barr on this one. I had a hair algae outbreak in the fall, cut back traces, nothing, cut back feeding, way back, bingo, no more hair algae. So I'm going to say that no, excess traces won't cause algae, but there are limits to all things, many of the traces become toxic in higher concentrations, so follow the bottle.
If you're mixing your traces from solid, I mix 1tbsp. in 125mL water and dose about 3mL every 2 days. I alternate trace and macro dosing, works well since my tank brings NO3 down by about 5ppm in 2 days and cuts PO4 by about half as well.
You can add straight to your tank, but as Blinky so wisely put it, it's best to dissolve them first. One good example is Mg. If you find a need to dose Mg, you'll probably notice on the dosing calculator that an MgSO4 solution becomes saturated before you can make a solution with a convenient dose, so you add it straight to the tank. I have a dollar store measuring cup that I use for stuff like this, add a bit of water, add your ferts, stir, add to tank.
) . I bought a bottle of Seahcem Flourish today for micro nutrients such as MG, iron, etc..... How much of this should i add daily in ml? Will overdosing micros do any harm...algae?
