I don't have them anymore. I sold them a few months ago because I'm getting ready to move. Anyone want to buy some Saphire glass? lol
My tigers would fight and the smallest one would get battered on a regular basis because I don't think my tank was big enough and I didn't have enough dithers. They were shredded up one by one over time. I've never had more than one GATF at a time so I can't say from experience how they get along in a group but from what I've read they don't do well with each other.
As for flow I would think that pushing through the middle of the tank would be best since they don't hang out at the top. Mine spent most of their time mid tank and towards the lower part. My flow was also mid to lower level too.