if u keep ure arowana really well fed there is less chance of it hunting for food in the air. furthermore, the diet which u choose to feed it while it is young is very important! like i never fed my silver arowana insects. only floating pellets and dead fish from the market. that way they might not be easily distracted by bugs or geckos compared to arowanas who eat them all the time. my usually only associates dead fish as his main food source now and is too fat or lazy to chase other things.