I have decided to remove all my lava rock, keep my black sand and do stones, fake plants, and drift wood in the new setup. I'm going to have 3 CPO crayfish. Those will fill the bottom of my tank but for the top I was thinking about doing one large main center piece fish or group of medium fish. I had my heart set on one blue marble angelfish as the center fish but I read somewhere that they do not do very well in stronger currents? is this true? I have a larger external filter then I should so my current is relatively high but not so much as a power head made for current. If I can't go with an angelfish as my main center piece fish I might do a group of dwarf blue gouramis. Would 10 dwarf blues be to much for a 29 gallon tank to themselves other then crayfish?