i have a tall 29g 78f i have two peppered and 7 green/gold corys five rosy barbs and 5 cherry barbs two filters air stone lightly planted tank plenty of hiding spots my green corys are extremely skittish and run away everytime i go up to the tank and are always breathing rapidly i feed them bug bites for bottom feeders and nobody picks on them any tips on how to get them to dtop being so skittish should i get more corys? i also do water change twice a week of 50% or one of about 70 a week