When placing a fish into an unfamiliar aquarium environment, the first 7 - 10 days can be a critical period: depending on the method of capture and time in transit, and perhaps most importantly the feeding requirements of the species in question, some fish may refuse to eat for several days, during which time their energy reserves are depleted and chances of contracting illness are increased. It is therefore of vital importance to get the fish eating an appropriate food as soon as possible.

Some species are more problematic in this regard than others; within the former group, various species of angelfishes, butterflyfishes, and the Moorish Idol are of particular note. AngeLixir improves feeding response and provides important amino acids in sponge tissue ratios, as well as providing marine proteins to increase the protein concentration in foods (particularly beneficial to fish that have lost body mass).

AngeLixir is not meant to be a substitute for proper husbandry, or for making ethical decisions regarding the feasibility of maintaining spongivorous species in captivity; it is, however, an effective means of improving food palatability and nutrition, and increasing the chances of all fish species acceptance of unfamiliar foods.