yes mix up the teas yourself, its alot cheaper that away.

when brewing the tea 70s-low 80s is great to attract microheard life. if temps are too low or high the microheard has a harder time surviving and killing off the bad bacteria and life.
also when brewing your tea its best to brew from 24-72 hrs depending of the guano type, if its the powder type 24 is good enough, if its pellets and keep whole brewing for 72 hrs is alot better(but i crush up my pellets).

if you brew your teas and dont use airpumps or agitators your mixture becomes anarobic and the bad bacteria start to thrive and kill off the good microheards. that is not good. and when you are brewing your teas and you see a foam on top of the water it is a good idea to skim off the top and throw away, its dead bacteria and useless and helps the tea to stink more

when making tea, in a 5gal bucket i use about 3 tablespoons of either high n or p guanos with ewc and mollasses and seaweed product. the mollasses is a great food source for the microheard bacteria