Believe PeterGwee answered most of your queries.
I have some thoughts about your setup though.
Your tank is a 3ft, and you have 82 fish in there, not counting shrimps. Now, I don't know how much a 3ft tank can stock, but that sounds to me like a real high bioload.

I do not know what you have in mind ( some people have high stock of fish to fertilise their tank another way ) but just in case you do not know, that high bioload and improper fertilisation will cause algae very soon. And your tank isn't thickly planted enough to soak up all that fish/fish food waste, unless you have a very efficient filter. Of course, if things are all allright, good job.
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