29 Gallon Tank What's wrong with my plants?

About a year ago I tried starting my first planted fish tank, for substrate I used miracle gro organic potting mix capped with imagitarium black sand.

Lighting: Finnex 24/7 planted light on 24/7 mode.

I did dose with easy green for a bit but it just didn't seem to help so I stopped. I had a bunch of plants but they died off, all that remains is a few Amazon swords and some valisneria. I also have floaters that came from the plants I bought. Below is a picture of what the plants currently look like. I have been nothing but frustrated and discouraged as I just can't seem to fix whatever is wrong.

 

Does 24/7 mode mean your light is on 24/7?

 

Does 24/7 mode mean your light is on 24/7?

No it has a special lighting cycle, in the mornings it slowly comes on with this orange sunrise and slowly turns into the normal white light, then towards night there's a sunset that turns into blue light for moonlight, the. It slowly dims off.

 

Okay just making sure lol! So how long is the light kept on?

Since you have Amazon swords I recommend getting some root tabs, swords are root feeders and depending on how long your tank has been running, the nutrients in the soil will start to deplete.

I would resume the Aquarium Co-op easy green, I use it in my 4 planted tanks, works like a charm. I dose twice a week.
Set a reminder on your phone if you can't remember.
You could try a more hardy plant species like java fern or anubias, both must be tied or secured to rock or wood rather than planted in the substrate.
I also recommend water sprite, grows too well IMO!

 

Okay just making sure lol! So how long is the light kept on?

Since you have Amazon swords I recommend getting some root tabs, swords are root feeders and depending on how long your tank has been running, the nutrients in the soil will start to deplete.

I would resume the Aquarium Co-op easy green, I use it in my 4 planted tanks, works like a charm. I dose twice a week.
Set a reminder on your phone if you can't remember.
You could try a more hardy plant species like java fern or anubias, both must be tied or secured to rock or wood rather than planted in the substrate.
I also recommend water sprite, grows too well IMO!

I think the problem is that my sand on top of the potting mix is to small which makes it hard for plants to move the roots to the potting mix, I'm not sure though I'm trying to research the size of imagitarium black sand but it doesn't state the size.

 

I doubt that would be an issue, I have basically the same type of substrate in 1 and soon to be 2 of my tanks, potting soil capped with pool filter sand, and the 3rd is FLuval stratum capped with sand too.

 

It looks like your floaters are blocking a lot of light, have you tried keeping them more cleared out? Swords are heavy root feeders, so some root tabs would be good to try. If you don't have heavy water column feeders (besides the floaters) like stem plants, then liquid ferts shouldn't be necessary. Fertilizer (root tabs) and more light (by removing more of the floaters) would be where I would start.