Here, we use the term "hybrid coordination network" instead of "metal-organic framework" to describe these systems as the latter may imply a 3D dimensionality as well as porosity, whereas the former designation better captures the bonding scheme in the studied system. Structurally, in the crystalline state, the Co(hmba)3[CoBr4] system consists of octahedral Co 2+ nodes connected through weak coordination bonds to uncharged hmba structures in a 2D layer-like structure, with non-interconnected charge compensating [CoBr4] 2-units situated in between network layers (see Figures ). While this glass is water-soluble when being submerged in water, we show that careful water addition results in significant alteration of physical properties including the melting and glass transition temperatures. Both experiments and ab initio simulations show that water facilitates breaking of the network-forming Co-O bonds, ultimately allowing for the tuning of glass properties within this glass family. We believe these findings pave a new avenue for tuning the melting temperatures of other hybrid crystals to allow them to melt before thermal decomposition, and hence allow the formation of a broader range of melt-quenched hybrid glass compositions.