Hello, everyone. I have a new 20 gal Tall aquarium with 6 bht and 4 Emerald corys. I started out with just the 3 tereas dor a few weeks. Then I added the corys ans 3 more bht. My question is about behaviour. Thw tetraas were all together and then they seemed to split into groups of 3 and just chill in the same spot. Now they are all behind the driftwood except for one little guy. Is this normal pecking order stuff. My parameters are all in healthy according to my tests. My fish are driving me crazy. Lol. Ugh.