A couple questions about guppies and gourami

[Darkness]

Ok I have a 29 gallon tank with 6 platies, 6 guppies, 8 ghost shrimp, and a dwarf gourami. My first question is is my gourami a male or female? I think its male but don't really know.
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I was thinking about getting a second gourami, a powder blue. if it is male, should i get another male, or a female, i want to try to reduce aggression in my tank. i want them to swim together, not fight

also im wondering if my guppies are pregnant. ive read about the gravid spot, and two of my guppies have really dark spots , but theyve been like that for a while and im not really seeing much change. i dont know if the black is the gravid spot or something bad.
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sorry for the horrible photos

also im starting to get some green algea on my tank walls, and was wondering what some good algea eaters would be, that look cool

[hungryhound]

I cannot answer everything, but your gourami is a male. Female dwarf gouramis are a silver color.

I am not sue about mixing two dwarf species though. I have only had dwarf flame gouramis in my tank. I had three males in a 46 gallon and they kept their aggression to themselves.

[Zerileous]

to handle the second part of your question,
your guppies are quite pregnant. If you want to sucessfully breed them, you need to move the females to a fry tank and remove them shortly after the fry are born. If you want to let nature run its course, thats fine too, and you will have far fewer surviving guppies (which is probably a good thing unless you have room for a TON of guppies.) The guppies and platties will breed like wildfire.

As for algae eaters, look into:
oto catfish
cherry shrimp
amano shrimp
mystry snales

Also you can just manually remove the algae if you wish. Keep in mind that some algae growth can be halthy for the aquarium because the algae "eats" nitrates (which will build up to toxic levels requiring a water change regardles, just more slowly with algae).