Hi - how's the danio? If it's still poorly, I'd suggest posting in the Tropical Fish Emergencies section - you usually get some good advice there quickly - there are some very knowledgeable and helpful experts around.
The first thing they'll ask for is your water statistics (readings for ammonia, nitrite, and pH in particular), and some basic information about your tank, size, age, stocking etc.
Good luck, hope it's on the mend.