01-10-2011, 07:43 PM
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I don't often disagree with Kymmie or 1077, but in this case I must at least interject a caution. The beautiful caudal fin and dorsal fin extensions on Congo Tetra are too tempting. While in such a large tank and with a sizeable group of Tigers, they may be less inclined, but it is still a risk that I would not want to take.
My group of Congo, some years ago now, were rather quiet. But then, they were the emperors in the 55g and had no problem fish to harass them, so maybe they were more relaxed. Tigers are very fast active swimmers when they are in good health.
I realize you said you can't get them, but other medium-sized barbs are good tankmates for Tigers, along with the larger rasbora species, and any of the loach species suited to the tank (they need to be in a group of 5+ and some species do attain a foot). Any active swimming fish would probably work too.