Red numbers positive and negative

Answer from: dsgdfh
It's how much the boosts you built on the island affects the amount of income you get from your dragons.

Answer from: Hdhsjwbsyah
Boosts effect how much money your dragons make so if u have a water boost and a lightning dragon on the same island the lightning will be brought down 20 percent

Answer from: Grainofsand27
That doesn't really answer the question. why would it matter if you're still collecting coins? i haven't shown the boosts to add any value but points. the pos/neg coins need to mean something else, the neg ones earn just as many coins per min as some of my positive dragon coins do.

Answer from: Cassie
When it's positive you get more coins I have a solution that will make most of your dragons except three happy the first island you put cold metal and air the second island you put fire and lightning ( and sun rainbow and moon) the third island you put plant water and earth and If you have a fourth island that is where you put all of your stuff

Answer from: Miloan
Better solution. First island: air, plant, water. Second island: fire, earth, lightning. Third island: cold, metal. All dragons happy. Put Tree dragon in earth habitat.