Hi guys, I'm getting two babyish (~5cm) dats tomorrow, they'll be having a 490L (130 Gallon) tank to themselves (I plan to eventually get some baby oscars when the dats are bigger), the tank's fully cycled and has plenty of caves for them to hide out in, what I was wondering is whether I should get some Danios or the like for dither fish, so the dats realise it's okay to come outside. Is this a good idea, or will they just scare the dats more with all their movement?