u/Small-Barnacle-3366

hello everybody this is my first post here, i have 4 marimos 1 has split which i have tied up with a rubber band to try to help it keep its shape, some backstory i bought these about 2 1/2 years ago for my bettas fish tank, he died a few months back and i moved them from the tank to this glass vase and im not sure im taking care of them properly due to the one falling apart . can anyone please give me tips and advice on how to properly care for my marimos! also in the first pics there is a lot of like debris in my vase and i just cleaned their water a week ago does anyone know what that is from? thank you!