I have posted this before, but this site cover fish food quality.
http://www.oscarfish.com/fish-food-ingredients.html
be sure to read the information closely
Dainichi veggie
"Oscarfish.Com Rating: 5 Stars
Sufficient (assumed high quality) preferred proteins and use of Calcium montmorillonie clay borderlone justify, at minimum, a high level 4 star rating. Even if absent Ethoxyquin, likely use of synthetic vitamin K and the ratio of non-preferred protein sources remain concerns. Based upon the quality and quantity of preferred proteins, including sufficient preferred plant proteins, we'll assume the ratio of preferred proteins to non-preferred proteins and binders sides on the positive and award this food a 5 star rating
"
NLS Thera A
"Oscarfish.Com Rating: 4.5 Stars
The high quality of preferred ingredients in this food would easily justify rating this as a 6 star food. However, the potential use of Ethoxyquin prevents rating it above a 4 star food. A shame as this is perhaps the best list of ingredients and preferred proteins available. The combination of high quality whole animal protein and preferred plant products, as a natural source of vitamins and minerals, would otherwise rank this food as premium. It seems an injustice to rate this as a 4 star food but until the Ethoxyquin question is answered, it cannot be rated higher.
"
I only use thera, and while reading over what I use and what they rate the highest both have the exact problem neither one says they do use Ethoxyquin or not use it but Dainichi receives a higher rating and has much lower quality of proteins seems like a very poorly interpretation of the products. They are going off there Sales slogan stating everything is safe for human consumption into this product.
I do like how its stated that the Thera A is the only food that could be close to the 6rating based on what it uses the Ethoxyguin or the vitamin k montmorillonie or neither.
Just some more food for thought!