Many people asked me about DIY amino recipy, so here is what I use:
My motivation was "acro-power". Many people around kept telling me about amazing results after using it. I tried it myself. Did not see results right away but it's all about patience, right. I couldn't get over one thing - it's price. So I decided to experiment myself.
http://www.advancedaquarist.com/2015/5/corals - good article about aminoacid in corals.
Aspartic acid mentioned as most common in corals, so I started with it (you can buy it at amazon/ebay - make sure it's pure powder, not a tablets). $10 bought me a triple-lifetime supply.
I saw immediate feeding response in corals when I target fed them.
Later I decided to use complete amino mix. Few places sell it online. I use cheapest mix I found - CompleteAminos powder (Gematria.com).
Human amino-mix is not optimized for corals. However, it's not important IMHO:
1) It's dirt cheap. If I decide to make custom mix (it's easy since all aminos are sold online in powdered form) then it'll cost me much more
2) 99.99% of aminos are eaten by bacteria anyway. Not used aminos provides extra DOC
Mixed teaspoon complete mix + 1/4 tsp of aspartic (I have it and I don't want to trow it away) with 500 ml of RO water. Had to use warm water to completely dissolve the mix.
Interestingly, I was able to keep solution of aspartic acid for couple of month in dark closet but complete mix solution went cloudy within couple of weeks (yammi organics for bacteria?).
So I bought sodium benzoate (same preservative used in coca-cola). Again, $10 (or cheaper) bought a more than I can possible use in next 500 years. Add it at 0.1% (max FDA permitted dosage). Have no spoilage problem anymore.
I started adding about 5 ml daily per 200 gal. Slowly increased dosage to 10 ml. No problem so far.
Mix is used for target feeding twice a week (no water added):
1) Cheapest unsweetened soy-milk - 50-100 ml
2) Reef-roid/coral frenzy/any other mix
3) DIY aminos - 10-20 ml
4) Clam juice/blended shrimps (sometimes, if I have it)
5) DIY Selco (make it myself as well)