i believe they develop the red coloration once they reach sexual maturity.
i use prime too, alway have infact if there are a few brands of the same thing i always choose the seachem product.When I got mine from, they were not as bright red. In fact, they looked like bsmith782's photos, even after several months. After switching to Prime, instead of Stress Coat, plus also feeding more bloodworms, the majority seemed to get bright red after a week or so. I'm not sure if it was due to switching to the Prime or maybe the red pigment in the bloodworms that did it. Since then, I never changed my routine.
can you get this from a fish store or do you have to order it online?I have a 10 gallon tank in which they are fed exclusively on living algae because of the position of the tank in partial sunlight. These take longer to to turn red than those in my 40 gallon tank, which are fed on JBL Novo Prawn as well as anything they can take from the plant matter. The growth rate is also faster in the larger tank, but that may be attributed to the size as well as the supplemented diet. I must say, I'm quite happy with the results from the Novo Prawn. They don't dissolve as much as the Hikari Algae Wafers that they used to get. As a result the tank stays cleaner.
can you get this from a fish store or do you have to order it online?