Think that it will be looked very interesting and funny. What do you think about corals? I also like customized fish tanks. I have three big aquariums with a lot of corals, rocks and etc. However, to have such fish tank, you need to be very attentive and before to put something new there, I recommend you always to use cleaners. There are a lot of cases than in corals there are worms. For example my friend got
bobbit worm. It is very nasty. I hope that you understand why cleaning is so important.