Uknown strain balcony grow

This seeds were old and this might be the reason why the grow is so slow. I do an Angel organic grow using coffee grounds on soil and urine diluted with tapwater. I use Tap water with no right pH(my tapwater pH is between 7 and 8). Do coffee grounds help me to have a lowerwph?

Yesterday i had to transplant it in smaller vase due to a fungus gnats infestation. This annoy me a lot. I think i used the wrong soil, because while inspecting it, i found mushrooms bugs and larvae in it. The soil drainage was insufficiente, and i also overwatered it.

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This week was great. They have grown a lot. Should i try LST on the big one ? Can i start to give some nutrients? I have given only some of my urine once a week.

I am very satisfied by the progress of the biggest one. I still dont know when i can tell if they are females or males. When should i transplant them?

They keep on growing!!! Eskereeee🤣🤣👍👍💪👌