We're thinking about getting a pair a bangaiis for our frag tank to hopefully try our hand at breeding them, but wanted to make sure a 20 long would be big enough for 2 of them. This tank is tied into our main system so its 100+ gallons total volume, so I'm more so concerned that the 20 long is going to be big enough for them. The only other stock in the frag tank is a darwin clown and a few peppermint shrimp. Thank you for any input