Ok, got a 7" oscar last week settled fine into tank bought a new oscar today, about 9". they keep fighting with each other since i put the new one in just lip locking like they do..... should i take him out straight away or should i give them time to get used to each other and find their own dominance in th tank,,, there in a 300g tank what you think???? someone must have an idea what i should do.... im afraid soenone gonna die tonight......