The last major determining factor in the health of your aquarium. Depending on the lights and co2 you have will decide how much fertilizer you need to add to the aquarium.
There are two main groups of Ferts, the first is Macronutrients – Nitrogen Potassium Phosphorous, and these are usually supplied within the water through both the fish and feeding, but with lots of plants you will need to add extra.
The micronutrients are everything that aren’t macronutrients, so iron Boron, Calcium, Chloride, Copper, Iron, Magnesium, Manganese, Molybdenum, Sulfur and Zinc. These can usually be dosed with commercial fertilizers but extra Iron may be needed to suffice to the needs of some plants.
- Seachem Flourish and NPK – Great fertilizer products, will work well, but they are expensive to maintain, if you bought them in bulk you could definitely save a heap.
- Make your own – Sure you could make your own fertilizer, it is best to have an idea of what breakdown of nutrients you want for your fertilizers and to make sure the chemicals you add are not harmful to your fish.
- PMDD – Yes we’ve all heard of it, the infamous Sears and Cronin recipe that struck up a storm - poor man's daily drops. This definitely does work and will fertilize everything all at once, it is extremely cheap and can be made up in a matter of minutes. So why doesn’t everyone use it? I guess some people prefer to stick to the commercial product lines. Some stores will now stock the basic dry mix at a very cheap price, be sure to look into this.
- Iron additives – These will help your plants keep in tip top condition; it is one of the most important additives. It should also keep red plants a bright red colour and is the only element which will need extra dosing.
- Dupla fertilizers – These just like any of the above fertilizers will work great, there is a point when we can expect minimal difference between each of the products, they all have the same thing but products like dupla provide the commercial trust.