Are there really any triggers that are reef safe? It is said that crosshatch, niger, and bluethroat are reef safe. I have seen things that are contrary to this. Is this because they eat your snails or is because they eat coral? I am willing to buy new snails here and there if it means having the fish i want. I am looking to stock 2x comb tooth blenny, maybe pearly jawfish, wrasse that max out from 5-6", a tang, bicolor goatfish, and anthias. How big of a tank would you need to house 1-3 nigers, a parr of blue throats, and maybe a pair of crosshatch. IF AND ONLY IF they are actually reef safe!
Generally look to the Xanthichthys family of triggers when considering "reef safe" my friend. Agree with much here. The Niger needs a tad more vigilance than the Crosshatch, Sargassum, Pink Tail... In reading threads like this I have seen 80-20 pro Niger. My experiences have been good and I also know who is responsible when hermit crab/snail shells are empty. Your initial question was about keeping as many as 7 triggers in the same tank. If you can afford a tank that large-you are living large.