Sick Tangs

[aquaman123]

I just lost a Hippo with what started with a few white spots smaller than grain of sugar. Treated with cupramine and formalin dips, the first day a inch long red and white striped worm was attached to the glass of my hospital tank.After that he had some black eruptions appear on his body and a week later he died. Now I have a Powder Blue scratching with 3 white spots on his pectoral fin, eating alot alge, #1 and #2 flakes. His is in great shape, nothing on the body. Ive had them for 4 months. Each had a 6 week quarintine before I put in display tank. I have dipped his Nori in Flagyl for about a week but it is not helping. So I am panicking. Please help.

[leebca]

It is good to quarantine fish, but if the quarantine doesn't include all marine lifeforms and if it isn't performed diligently and carefully, then parasites and undesirables can find their way into the system.

Probably the starting point to any situation is a good diagnosis. Without knowing exactly what it is your trying to fight, it is hard to win. With sites like Reefland we can only guess as to what might be cause, so we need photos and a lot more information than you've provided, to help with getting the best diagnosis under the circumstances. Otherwise the hobbyist ends up taking a shotgun approach to curing with no idea what the chances of success might be (other than spending a lot of time and energy and worry).

For now I don't know any of the following and without more information I cannot help much more that what I have written below:
How old is your tank? When did it originally cycle?
What is the size (dimensions and gallonage) of your aquarium? Does the gallonage include the volume from the sump and any refugium?
Do you use carbon, skimmer, mechanical or other chemical filtration? List all along with their maintenance.
Do you have live rock in the system? How many pounds or amount and where is it put?
Other than live rock hitchhikers, list all marine life & sizes in the tank (fish, inverts, corals, clams, snails, crabs, shrimp, etc.).
feeding schedules
Do you use any vitamins? Fat additives? Any elemental or other additives? Please list all.
Chemistries – Do you test for Phosphate, alkalinity, calcium and magnesium? Please give actual current numbers for everything. I would like test kit test results, not dip stick results and actual numbers even if you think all is fine/okay. Have these numbers been changing lately?
Water parameters – please give actual numbers (pH and your pH range, salinity or sp. gr. & range, temperature range)
Do you see any of the following in your system: hair algae; micro algae; cyanobacteria growths (red slime algae); dinoflagellate (zooxanthellae) growths; brown algae; diatom growth; slimes; off-colored patches on rock or substrate that are not coralline; etc.?
Water changes (how much and how often).
What is your source water? (Tap water, RO water, DI water, RO/DI, distilled, etc.)
List what you added or taken out of your aquarium system (living, decorations, and equipment) during the past 6 weeks.
Maintenance schedule.

From what you've posted so far, there is a good case to say that at least Marine Ich is part of the problem. The eradication of this parasite requires removing all fishes from the system, putting the fish into a hospital tank and treating them for this condition.

Meantime, the display system must go fishless for no less than 8 weeks.

Regarding the treatment, it doesn't include Formalin for Marine Ich. This goes back to the question of diagnosis. That is, I'm not sure what other condition you think or have been told the fish have. But surely, in a proper quarantine process the huge odds are that it would have shown itself before the fish went into the display.

So now is the time to back everything up -- fish to the quarantine.

Lastly is nutrition. The fish can't be expected to fight off parasites and bacterial agents without having the proper and best nutrition. The flakes aren't in this category.

The above leads me to suggest you start doing a lot of reading. These are the things to start with, at least:
http://www.reefland.com/forum/marine...e-process.html
Feeding Marine Fish and Fish Nutrition

Then you want to search the Internet for photos of ill marine fishes to find what you think look like your ill fishes to help with a better diagnosis, or provide photos and the missing information noted above and we may be able to help more.