Like Rixy said, try not to mix them with any fish that look similar to them like arowanas and fish like that...my pike attacked my jardini during the first two minutes it was in the tank....had to take out the pike and later the jar died of its injuries...they sport some wicked teeth...just my .02 Gl...rixy;774133; said:you have to be careful of anything that looks similar.i put a gar in and my pike started opening and closing his mouth pretty fast like he was pi***d off or excited,then,bang,he had the gar in his mouth.luckily he dropped it,i put the net in and caught the gar and put him in my spare tank.be careful what you put in with the pike.ive only had mine for 2 weeks so im no expert.