Guppies and danios are good, mollies are ok, and goldfish are really fatty, so not the best, feeding freshwater fish is not that bad, it actually gives the fish a break as they are always trying to osmos salt from their system as they are constantly consuming salt in the sea water they swallow, feeding goldfish, and goldfish only is not good as it is an unbalanced diet. Mysis shrimp is a freshwater product and it is known to be of the best foods out there for marine fish... I am lucky because I always get people giving me damsels, and chromis, and I can always order extra damsels that are on special, at wholesale pricing.... I wouldnt want to be feeding marine fish bought from a store, I would be broke like a joke... hopefully you dont have many dead fish lying around, but when I get large orders in, there is always a few that didnt make shipping, or are very close to death, they get fed to my anemones, a 8"+ anemone will take in a 4" tang like nothing. By inverts what do you mean? anemones? shrimp?starfish?