Aside from Hybrids from Project Hybrids, Project Breeding is also underway and is the faster way to produce more monsters.
The reason why breeding give more monsters is because the clones used, in this case various female clones, only require genetic materials from the females and only need Middle-Grade Growth Tube to grow in a single day.
Using High-Grade Growth Tube would took about an hour to create the same clones. With how obsolete the Middle-Grade Equipment starting to become, and how greater number not a goof enough reason to keep them, Alros had destroy the remaining Middle-Grade Equipment and bought High-Grade one.
The change had been considered necessary, especially after the upgrade of the system space level, increasing the space for equipment.
With 300 High-Grade Growth Tube, Alros could create many women for his Demon Goblins, and Demon Orcs, increasing the population of said monsters. With it, his armies of Demon Monsters slowly rising.