05-10-2012, 08:46 PM
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You will need to research about the aquarium cycle, that is probably the cause of the Danio's death. Basically, your new tank have none of the bacteria necessary to convert ammonia (produced by the fish and other waste) to nitrite (both very bad for fish, it burns their gills) to the not-so-toxic nitrate. It will take 4-6 weeks to have enough beneficial bacteria. In the meantime, there is a few things you want to do.
1. Go buy an API master test kit, or other liquid test kit for ammonia, nitrite and nitrate. Without this you are blind and won't be able to do much. It's one of the most important piece of kit, and one of the most overlooked.
Whe you have te test values, post them back, we will help you. Since I am guessing you probable want to deal with this right away, you have a few solutions to control ammonia and nitrites. First, you will need to do water changes (50% of tank volume) every other day, or when you see more than 1ppm ammonia or 0,3ppm nitrite. Use a water conditionner that will detoxify ammonia and nitrite, Prime is a good one.
Add fast growing aquarium plants, mostly stem plants or floating plants. Anacharis, Wisteria, Hygrophila, Water Sprite, Brazilian Pennywort. They will use the ammonia to feed themselves.
You said you saw white spots on the Danio. Look on the other fish, do they have white spot too ? If so, report back, we will evaluate the situation. Right now, avoir buying or using any medecine, they are toxic to fish and bacteria.