It is no fun to have a planted aquarium where the plants are not growing healthy and happy. Therefore, it is important that we maintain good quality water and fertilize our aquarium to give the plants the proper nutrients they need to grow. However, there may be some instances where even though we fertilize and give our plants the food they need, we can run into plants showing deficiencies due to over dosing or under dosing. Below is a simple diagram that lists some of the common signs of plant deficiencies that you may see in your own planted aquarium. Please note that this diagram does not cover all signs of plant deficiencies, but rather the more common ones.