Releasing predator insects into your hydroponics garden infestations of spider mites can be eliminated or, they can be avoided. There’s no need to worry with predator insects, because most will not harm your crops. Your garden should also be able to support the predator insects. Many biological insects will not survive if the temperature is too hot, or if there isn’t a good source of water. The more plants you have the hotter your greenhouse will usually be. A temperature control unit can be set to turn fans or blowers on and off at pre-determined intervals. They can also be set up to open and close air ducts in your greenhouse or grow room. As you progress in your hydroponic garden hobby you may also want to switch from an aquarium pump or bubbler system to a more advanced irrigation and drainage system for your garden. Many formulas also contain buffers to help prevent extreme swings in the pH level. PH is a measure of how acidic or alkaline the nutrient solution or water is. The pH scale ranges from 0 to 14, 7.0 neutral, and 7 to 14 alkaline. General plants prefer the pH to stay in the 5.5 to 7.5 ranges as going beyond this range inhibits certain nutrients to become less available for the plant to absorb. If your plants are grown hydroponically, they will be healthier than plants grown in soil, because all of the growth elements and nutrients are made readily available during growth. Hydroponically grown plants also grow and mature faster, yielding an earlier harvest of vegetable, herbal and flower crops. In areas where food is traditionally produced, but where fields are over crowded or stripped of their nutrients, hydroponics is a way food can be produced using a minimum of space and resources. Hydroponic growth leads to an increase in production over traditional farming in two ways. For one, hydroponic gardening just plain saves space. Signs of air pollution include spotting or twisting of the plant’s leaves, flower and bud fall off, and unusual discolorations as well as poor growth can signal a problem. Remember, plants are affected by the following elements: air, temperature, light, water and pollution. If you take all of these things into consideration when planning your hydroponic garden your plants are sure to thrive under your care.