Cool little jararium. I think the plants in there now are probably just fine with the light you have. How long has the tank been set up? A few days is not enough to diagnose some kind of trouble with nutrients or light, I think. Plants in many cases will need to convert themselves to your water, nutrients, and lights. Look to any new growth for indication of plant health.
Algae will need your hands on it at first, perhaps the plants and fauna will take it out after some time.
The spigot may become an issue, depending on lots of variables (pH, dissolved Oxygen, CO2 content, the actual metal composition of course, etc). I’ve had brass fittings in tanks with no issues, though these were designed for plumbing. Who knows about your spigot.
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I can only grow plants when they're completely under water. Everything else is doomed.