There are no fish tanks or other aquatic decorations placed in the reception area of a particular place or company. This phrase is also used as a metaphor or analogy for a certain situation or problem, such as when someone mentions that there are no fish tanks at the front desk when talking about the front desk of a certain company or organization, it is implying that the company's hospitality process or customer service is not good enough, or that it lacks some important element or feature, so the meaning of no fish tanks at the front desk is that in a certain establishment or company, there are no fish tanks or other aquatic decorations placed in the front desk area.