I really don't want to throw perfectly good plants away cause they are still alive and happyHow about throwing the plants away, changing the water and cleaning everything?
tried shrimp cant seem to keep them alivedo some water changes, add some floating plants and some shrimp, see what happens
this is the light hereCommon algae is natural and present in all our tanks (if they are healthy bio-systems), but "problem" algae which is what you have here is not something we want. The cause is always the same for any "problem" algae, an imbalance of light and nutrients. With plants in the tank, the aim is to provide adequate light (this involves intensity, spectrum and the duration) for the plants, and at the same time adequate nutrients. As soon as one of these factors is out of sync, algae is able to take advantage.
We will need to know data on your lighting. What type, the spectrum (Kelvin or CRI number), and how long it is on daily.
Nutrients include natural organics from the fish being fed, water changes, and any fertilizers. Information on the fertilizer(s) if any.
The only thing I put into my water for plants is aqueon plant food or it’s called something similar to thatThe link to the light recognized I am in Canada, and sent me off to different Petco sites, so I couldn't find anything on the light. Do you know the spectrum? I agree with Colin that reducing the duration is probably a good thing, 10-12 hours is a lot without floating plants to reduce some of it.
You also didn't respond on the fertilizer question. Substrate tabs like Seachem's Flourish Tabs will benefit the sword plants immensely, without leeching nutrients into the water to feed algae.