Let's go back to elementary school my friend- what you have highlighted is called punctuation. I was referring to your grammar, which is so bad that some of your ideas are incoherent. Below are a few examples:
I'm suck with number
It's solely about someone's interested...
Fish is suffer in whatever size tank you keep it!
Isn't that why they prohibit to release fish that has been in tank back into lake or river?
Neither you brag about your fish, nor share any idea.
This last one is pure poetry:
There's nothing to do with the fish in fishkeeping.
What does it have to do with if not the fish? Birds? This is not birdkeeping.
But let's get back on topic. Did you read about how plants like nitrates? Be a little more open-minded and you might actually learn something.