So many newcomers to the hobby are blighted by poor information on the internet dated from years ago, and sadly it's wrong. So I wanted to make it very very clear:
You cannot rely on fish waste for plant nutrition
If you rely on fish waste for nutrition, your plants will suffer a nutrient deficiency and algae will take hold. Now there are some plants (like vallis) which is like a weed and grows in almost nothing, providing water conditions are suitable. But I'm not talking about weed like plants. I'm talking about the plants sold on our website - the attractive potted one's that look truly wonderful given the right fertilisers.
So please remember this, and spread the word. You have to give your plants nutrition, and that always comes in a bottle form.