For myself I do a lot of pool work. I am not an instructor but am good friends with one so I often volunteer to go to the pool sessions with him to help supervise the students, answer questions and help out in any way I can. This allows me the opportunity to often drill scenarios such as OOA scenarios ect. This I believe has made me a better more prepared diver when I do hit the open water.
I do not however count any of these pool dives toward my dive experience or even log them at all. The experience while may not count on paper but it does show through on skill and comfort in the open water.
I believe this would also apply to you. While you may not receive any formal credit for these aquarium dives the skills you learn and fine tune there will carry with you in the open water and make you a better diver where a divemaster and dive buddy would notice your enhanced skills.
Well, I'm an instructor and I work with a lot of divers who are only OW certified. One of them asked me how it would work if they only had their training dives and then several hundred aquarium dives and they wanted to go for AOW. I told them that they need more OW dives before they can get the AOW but that I would probably expect more out of them since they had so many aquarium dives. I just wanted to find out here what everyone would say in that situation. Thanks so much to everyone for your input.