There are a few things to keep in mind, before choosing type of moss for a moss-wall.
- light-intensity is much lower at side of a tank - including side of back-wall. In most tanks light at top of sides is also low, given placement of light-source.
This means Taxiphyllum's (= ex. spiky and Java) are performing best in such conditions. Vesicularia's (= ex. weeping and christmas) will only perform well if light is adecuate and CO2 is sufficient.
- a "dense-growing" moss will do a better job of covering the mesh completely. Tying the moss back on mesh as it grows furthermore help this.
- for maintainance (= ex. trimming) moss can be tied to a "stiff" type of mesh (plastic or metal), covering entire wall.
This mesh can then easily be taken out of the tank, for trimming or re-tying of the moss. Consequently less "moss-waste" in actual tank.
............hope this is of help - it will prevent some frustration.........😉