Info from the Ecke website. The company that sold you the liners should also be a source for info.

Here is a link that might be useful: Ecke

New Guinea grow very differently from double impatiens. They need more night heat and are very sensitive to salts in the growing media. Go half or less on fertilizer, keep soil on the dry side, and watch out for thrips they will stunt and deform the plants before you know it... Bob.