Just for your info: Birds diagnosed with canker are carriers and will spread it to other birds in your flock, mainly by waterers/feeders. To keep it in check, I recommend that you purchase acidified copper sulfate. Dosage is 1/4 teaspoon per gallon of water for 3 days once each month. Dont use...
Blackhead is histomoniasis, the cecal worm is the carrier. No worms involved with trichomoniasis. Treatments for both protozoas are the same; metronidazole/flagyl.