The idea is variety. With the fish you mentioned I feel you're using the wrong things or at least in the wrong proportions. I think a diet heavy in veggies would be a better choice rather than the meaty things you've mentioned. Cooked veggies would be easier to get a bite of for your fish. Spirulina's a good choice but you'll have to mix it with other things to get them to eat it. It tastes terrible. I've used a freeze-dried product from the grocery, Nori (sp), in the oriental section. Soaking it with frozen brine and feeding the mix works. It's a good solution for SW fish also, puts a belly on yellow tangs and others. Hikari's lionhead actually puts a head on things like red humps.
Now, about treatment. I can't find a good solution. Once upon a time... you could have used a strong dose of Chloremphenical. The FDA removed it from the market as unsafe. People were taking it themselves, self-prescribed. The problem isn't as much what to use as how to get it into the fish. Basically treating a bacterial disease can be done three ways:
1. Add it to the water: only works if the fish has open sores. (for example, ulcers)
2. Mix it with food to get it into the system: Typically the first thing an infected fish does is quit eating. So... no go.
3. Inject it: I've injected fish before. It's not hard. Finding the right dosage is almost impossible unless you're a math whiz or an engineer. doctors normally have to work it out multiple times to check their figures before recommending the dosage. Too long, too expensive.
It's been suggested that bloat is a stress related problem. Fighting a visable disease just means that the fish's problem has progressed beyond it's ability to kept it in check. It's immune system needs help. Most stress related problems are environmental vs being picked on by another fish or something else. If you could eliminate the source of the problem the fish may be able to handle it alone. You also get get the same diatribe about recognizing the problem quickly and addressing it... BLAH BLAH BLAH.
Typical causes. 1. Too much salt. 2. crappy water- nitrates too high. 3. Lousy diet.
The first two can be addressed by doing successive water changes. The third by throwing out the old food you've been using and buying fresher stuff as well as more veggies.
There's literature to back up some of this and I've used that mixed with my opinions. I don't think I've run into the too much salt thing. I understand how it could happen though. Most people don't realize that only good freshwater evaporates. Salt and all the junk in the water are still there. When you pull water from the tank, you're diluting the junk and removing part of the salt. After refilling the tank, you only replace the salt you've removed. Take out 25 gallons, treat the tank with the salt you'd use for the 25 gallons NOT the whole tank.
I think doing the water changes, treating with the proper solution of salt mixed with a med that can be absorbed by the fish through sores or actually through the gill tissue is the answer. Currently, the only drug I know that's absorbed through the gill tissue, and available at fish stores, is Kanacyn. (kanamycin sulfate)
If you want to research this yourself do a Google or Yahoo search on bloat or dropsy. If you find something definitive, post back and let us all know what you found. Dan