What should I do about all thus green stuff growing in my gravel? The siphon doesn't take it off. Should I scoop it out and try to clean it somehow? Throw it in the garbage and replace it? Will it go away if I fix the light or something?
Have you got anything in the tank other than the plant?
You can kill it off by blacking out the tank for a few days, of course not good for that plant if it’s real or if there’s any living critters in there. There’s options for adding critters that should eat it too (shrimp/snails/ect)
Taking out the worst pieces and cleaning them of course is always an option if you had the ambition to go that route. I would probably just toss those worst pieces out and throw in some new stuff before I spend a bunch of time trying to wash it lol
Yes lowering the light intensity and/or the lighting hours will help keep algae from getting too intrusive
If this all started after the new light, that’s basically your issue. Too much light and not enough plant life to utilize the available nutrients, so the algae are taking advantage of it.
I agree a dark tank is no fun, best option is to reduce light intensity. That looks like an led light, which is hit and miss whether or not you can use them with a dimmer (if they don’t have a dimmer function built in). You may have to go with fewer light hours, more plants, or a different light that you can adjust