Patterns of habitat-wide spatial niche were investigated in coexisting gobiid species through a set of mesocosm experiments that mimicked the intertidal environment with inter-connected tidepools. Three species (Bathygobius fuscus, Chaenogobius annularis and C. gulosus) showed variable patterns of space use and growth which also depended on paired species. Based on experimental data, null models were constructed to assess intra- and inter-specific interaction among the three species. We will deal with issues related to their community organization and coexistence.