I am turning over a 5-gal tank to become a pea puffer tank. I recently added (about a week ago) 2 anubias plants, a Golden one and a large one (I don't remember the exact type) from aquarium co-op. They have sence been disintegrating and all of the leaves are falling off. I know plants often don't transfer well from being land grown to water grown, but I have also read a little bit about anubias rot and it seems to be similar to that. Any ideas on what is wrong with my plant and how I can help them?
Fish note: The disintegrating plants has caused the nitrite levels in my tank to increase so I have been unable to get my pea puffer, and my tank currently has no plants.
Photo note: I have put some of the leaves from the plant back into the soil, but don't expect the to live. I also added a photo of my overall tank for reference.