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Are you planning a planted only aquarium, no livestock! Different types of plants may have differing requirements (red plants is an example)! If you are planning to keep shrimps in the planted aquarium then you are best not using any fertilizer, the waste from the inhabitants is usually enough, and fertilizers can be very detrimental with shrimps? I would say that you should only need to consider fertilizer in a 'plant only' setup, but even then it may not be needed if using a soil type substrate, depending on the plants? Also fertilizer will encourage quicker growth which will require more maintenance time as everything grows much faster, so bare that in mind as well! My tanks all have fish and shrimps and I don't use any fertilizer but am weekly trimming/discarding plants.