So those of you that like to take your students to 100', do you set them up in larger tanks?
I ask this because, personally, I follow and recommend that no one dive deeper than the number of cubic feet of air they have on their backs. So when diving an AL80, we keep our max depth at 80' (yes, I know an 80 is only 77.4cf, but I get mine pumped to 3200, so we actually do have 80cf in them...).
If you do take your students beyond 80' in an AL80, what's your gas management plan?
BTW, to answer the OP's question, yes, 75' is deep enough to satisfy the PADI AOW deep dive standards.