I'm not an expert in this but here a couple of thoughts. Hang the tank or suspend it somehow and you will get rid of the reflection on the bottom. place the light behind, above and away from the tank and then use large white foamcore reflectors in the front on either side of the camera. This will give you more definition to the white shapes which will give more definition to the tank, instead of the two softbox reflections which are too obvious. Hope that helps!
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