Well depending on your financial situation, I'd just buy some garlic extreme. It's more expensive than squeezing your own garlic, but its really easy to use and I find that I am much more likely to use the easy stuff

It's like $15 here for a small bottle but it goes a long way. $15 is a drop in the bucket compared to how much most of us spend on our tanks, but if you're trying to be economical especially considering they arent even your fish, then squeezing a clove or two works just great.
I use Zoe and Selcon. Zoe is like 20 vitamins and some fatty acids and Selcon is pretty much just all omega 3 fatty acids. Marine fish need that. Well, I cant say NEED it because a lot of people dont add it to their fish food and their fish do fine. Suffice it to say, many people who feed foods either naturally containing omega 3s (like salmon hunks) or else supplementing with additives like Selcon find that they have much healthier and colorful fish. I ordered my Zoe, my Selcon and my garlic extreme online for about $30 total and it lasts me about 6 month which isnt bad really

I can eat that just one night out at a decent restaurant.
As far as the overcrowding, nothing I can do there to help you except to say catch some fish and distribute them to someone else who wants a free/cheap fish
PE mysis is a great product, continue feeding it, imo. Nori is good also, especially for the tangs. My pinktail also loves Nori, I mean LOVES it. Mine is pretty small, 4 inches max, probably more around 3.5" but he gobbles it down. He wasnt doing very good before I started feeding nori but once I started he really improved and is one of the fastest growing fish I've ever seen. My only disappointment in him is that his tail isnt pink at all, it is barely even orange

That first picture in this thread is my pinktail, the rest are all from a LFS. You can see his tail is pretty plain looking. I just dove with some REAL pinktails in Hawaii a week or two ago, they were amazing with BRIGHT pink tails, they made mine look like mud.
Anyway, I digress a little too far for a photography forum
My marine meat of choice is scallops. It's super soft and easy for any fish to eat. Depending on what tang you have, it probably wont do much with tough to eat meat, but I almost guarantee any tang will eat finely chopped scallops that have been sitting in a bag mixed with mysis and whatever vitamins and anything else you've put in there. I think part of the key is letting the food sit together for a while, like at least 12 hours and soak up the tastes of the other materials in the mix. For instance I mix up my food and let it sit on the counter for at least 30 minutes, then I put it into bags and freeze it. I dont just thaw the bag and feed right away, when my bag runs out I make sure you take a bag from the freezer and let it sit all day in the refrigerator thawed and then start feeding it the next day, that way everything soaks in good.
But yeah, scallops, tuna or salmon, shrimp... all finely diced... those are the main 3 that is in every batch of my food. Then just whatever is on sale at the local asian market I put in for good measure, sometimes its squid, crab or octopus, although most of my fish cant chew hard enough to get the octopus down, a little too tough and chewy for them. They like the challenge though apparently
Anyway, I've typed a book. Make sure you keep the tangs supplied with nori, soak it in something like Zoe or Selcon and you'll see improvement quickly. Fatty foods or supplements really seem to do tangs well, I dont think the nori we typically feed has everything they normally get when grazing in the wild. I know my tangs I've had in the past (dont have any atm but will have another in a couple days) certainly did better when I supplemented my nori with some kind of additive and they also enjoyed the pieces of food floating through the tank that my triggers left.
I've actually considered getting like 4 yellow tangs in my 210 but I think I might be pushing my bioload just a little too much
