guys..im having problem with RTC...just now my friend gave me his 1ft RTC to be kept together with my RTC(also 1 ft size)..the problem is my RTC keep chasing this new comer,bite his tail and fin...my RTC never been aggrasive like this before..is this some kind of territorial fight?has anyone keep more than 1 RTCs in the same tank?is this problem will prolong?do i need to separate them?...well any advices are welcome...please help. thanx.