Seachem is a great line of fertilizers. I used them when I first started out and they worked well, if I could have afforded to keep up with them, that would be what I'd still use today. It is okay to use just nitrogen and phosphorus. However, if you start noticing pin holes in your leaves, then you may need to add potassium. Obviously, you are doing something right as your tank already is very pretty.
Without Algae, death of mankind would be inevitable.
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