Plants that are newly introduced into the tank also need to acclimatize to the new environment.
In a new setup even the substrate need time to become biologically mature. Many microscopic changes occur when a substrate is submerged for the first time. Bacteria in the substrate that is used to air has to adapt to submerged conditions. Microbes that are used to being in air are outcompeted by microbes that strive in submerged conditions. Plants that are newly introduced into the tank also need to acclimatize to the new environment. In their adaptation process, they secrete waste proteins and carbohydrates directly through the leaf surfaces as they re-calibrate their enzymes and proteins to match the new environment. All these actions produce volatile organics and ammonia. This trigger various types of algae to spawn on the leaves of plants, smothering growth.