Not really. The only real UNIVERSAL TREATMENT is prevention -- keeping your water clean and monitoring water parameters. Healthy water will make your fish strong and help them resist diseases.
Fish diseases are like people diseases, and even a "broad spectrum" antibiotic won't get everything. That's why doctors do microscopic exams, or cultures, so see what antibiotic will work best. Or with most diseases, they go by signs & symptoms.
And, using antibiotics [or other disease "fixes"] indescriminently will cause other disease-causing organisms to become resistent to that drug -- which means, it won't work against the bugs you want it to fight.
So, when we treat fish, it's important to KNOW what you're treating -- and with fish we have to go by
- their appearance
- their behavior
- Close observation is vital -- watch for DIFFERENCES / CHANGES!
- Is it one fish, or multiple fish
- have there been recent changes such as recent rains, temperature changes, etc.
- have you added new fish
- and I'm sure there are more, but that's all I can think of right now.....
Sorry, TMI