What problems are you having? Full tank shots or close ups? Corals or fish?
If all of your photos have that ghastly blue (Windex) look, the first thing to try would be to experiment with your Radion's color control ability and reduce the blues temporarily while taking the photos.
Clean glass and pressing the phone flat against the glass are two tips. Pics with flashes rarely work out well. So fast moving fish will often be blurry, especially on a close up shot.
I can get acceptable photos on an iPhone 6 with a 6 tube T5 fixture, with 3 blue ATI tunes. But they'll never come close to a full featured camera where you can set your own parameters like white balance, especially one with a macro lens.