over stocked?

Hi. I want to ask you guys for an advice. I have a friend who just bought an arapaima. It is still 10 cm long. BUT. The tank he is going to put the paima is a 70 cm x 40 x 40 or so. I think it is enough at first BUT it already have some denizen in it. Here are the fish that inside: Giant...

Ok I had an issue little over a month ago about my Oscars being unnaturally shy. I posted my problem on here and went through all of the suggestions until I came down to the last resort of going with the idea of either adding some dither fish or as someone mentioned adding in another active...