Fish farm feed is not necessarily the best for long term feeding as they have different goals ( for example like feeding baby animals very high fat milk while adults don't need and don't use it well). Each species is different as to optimum requirements. We had a detailed presentation at the last convention on this topic.
Purina has an explanation on its web site about this question and Bill covered it - bulk ingredient differences can cause appearance differences (
http://aquamax.purinamills.com/aqua_faq_1.html ). I am not concerned about what is noted so far as the product is tested for variance all through the process (see the recall for slight increase in amount of D and E).
I am concerned about their apparent careless approach to customer service ( addressing concerns and questions). IMO we need to get past the sales reps and talk to the scientists at Purina.
IMO food quality from products of the major producers when the ingredients and amounts are close are not material to BG , CNBG ,RES , HSB , LMB and YP requirements in supp feeding. For example even supp feeding of 30 % catfish food is much , much better than no feeding for these fish species. With the CC food you likely get 75% of the value/result while the others may give 95% . So IMO with the similar type/quality foods by the different producers there is only a percent or two max difference when viewed in the light of nutrition requirments in supp feeding. If you are after the last few % of max results then there are several other matters much more important than what producer to use. If so then consider learning a lot more about each fish species and its nutrition requirments and look for producers of specialty feeds. Trout and other cold water fish are somewhat different and have special/different feeds.
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