However, there are a few things to consider:
* Territoriality: Like most fish, marble gobies can be territorial towards their own kind, especially if they are in a crowded tank.
* Stress: If a marble goby is stressed or feeling threatened, it may become more aggressive. This can be caused by factors like overcrowding, poor water quality, or the presence of aggressive tankmates.
* Specific individuals: While most marble gobies are peaceful, there are always exceptions. Some individuals may be more prone to aggression than others.
In summary: Marble gobies are generally peaceful fish, but it's important to consider their potential for territoriality, stress, and individual variation when choosing tank mates.