You should be able keep 3 threadfins/Glass Cards in there although i would be a little concerned with the 6 line harassing them at feeding time , as they are not very aggressive for food. That being said i have 10 in mine and i love the way they school together and add a real cool dimension to a reef in my opinion. Mine seem to be able to find a way get food in amongst 20+ fish so far although it's only been 3 months or so , time will tell i guess.
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