For your tea, you can find a shit load of mix's on line... If your plants are doing good, I would just let them be
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Any small fish pump will work in a five gallon bucket, use an air stone to help churn things up, a good foam on top will indicate things are working as should be,
I am trying Vics super soil this grow:
1 Bale sunshine mix #2 or promix (3.8 cu ft)
8 cups Bone Meal - phosphorus source
4 cups Blood Meal - nitrogen source
1 1/3 cups Epsom salts - magnesium source
3-4 cups dolomite lime -calcium source & pH buffering
1 tsp fritted trace elements
4 cups kelp meal.
9kg (25 lbs) bag pure worm castings
I also add 3 gallons of canna cococ, perlite, 1/4 tea spoon humisol and maykos.
I am 12 days in and have NEVER had Plants look so nice!!! I just hope they don't start yellowing on me, I hate chasing "N" deficiencies. I also have subcools super soil ( a modified version of vic's) but it's still cooking so to speak. good luck with ur grow.