Thanks for replying,
I have 6 mollies (2 males), 3 guppys (2 males),2 platy's (female), a plec, 3 clown loach, 1 ruby shark and a betta and also 3 shrimp that are in a breeding trap because they are far too small for the main tank they are also accompanied by a male guppy who has felt the bettas wrath. The only ones that are peaceful are the loaches, plec and shark. They all seem unconcerned with the frenzy above them, all the rest however are chasing each other around like mad, its not really dependant on species they just chase anything that comes near them.
we made the mistake of putting a betta in with guppys, we did not realise they were incompatible, we are currently cycling a small tank that can be used to seperate the betta from our main tank as he keeps nipping at the mollies aswell. Other than this mistake we have done our research throughly, and are really quite surprised at this behaviour. all ammonia, nitrate, nitrite, ph, temperature are all fine. We really dont know what to do and dont want to jeapordise their quality of life, but we are lost for an explanation.