Great stuff but a little watered down. They suggest dosing 2.5ml (half a cap) per 20 gallons once or twice a week. So if you dose it in 20 gallons twice a week, that 500ml bottle will last you about 1.9 years. This is for aquariums with plants or just to remove GSA (Green Spotted Algae). You can also add some nerity snails. You eat the GSA. This product makes it very easy to fertilize and with a small plant tank it will last a while. If you have a large aquarium I would suggest using a dry fertilizer. You can dose the EI (estimated index) simply by taking a certain amount of each dry fertilizer per day. This process is basically fertilization so you know you've hit your level and make sure you do weekly water changes so everything can reset and you don't have a build up of certain fertilizers. But what about this product. Basically, it's a dry enzyme mixed with water to make it easier for you. You usually use it in combination with Nitrogen and Potassium, which Seachem sells all 3 in the "Level 2 npk Plant Pack Improver" starter pack, but Phosphorus itself is one of them. Macronutrients required by plants. When you notice your plants are not growing and you are breeding algae. Perhaps it is time to start dosing fertilizer and it is this macronutrient that will help your plants grow.
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