Number of fish

[myfs_115210]

Hi

We are decorating for a wedding in a private villa at Hamilton island. They would like a fish tank in the bathroom and we are planning on a tall cylinder vase approximately 20cm diametre and 50cm height with small shells as the base. How many fish would you recommend and do you have any other suggestions or comments based on the information given above. The rest of the bathroom will be decorated with tea light candles and shells

Thank you :-)