i have a syno in my tank which is around 6/7" long, chunky and very active. its a lovely fish except it really seems to hate my albino common plec. is this normal? the plec doesnt even need to be near it for it to set off in hot persuit and chase it around the tank. the syno is getting more and more scratched up each night, and ive watched after lights out when the pleco appears and the syno is definately they aggressor. is it a normal syno thing?