I got this mushroom (discosoma I believe) around 5 months ago, it didn't look very good but a few weeks later it opened up and expanded. It stayed that way for a while but in the last few months it has started to retract again, the mouth in particular seems to have sorta disappeared. A few weeks ago it looked very bad with weird creases around the mouth, it seems to have improved a little now but there is just a hole in the centre rather than something resembling the original mouth and the coral is no longer able to eat any food. There is also some weird folding in the upper section as if it's splitting but it's stayed that way for some time now.
Both nitrate and phosphate are undetectable but I am using the API tests which I don't think are known for their accuracy (especially the phosphate test), I've attached 4 pictures of the mushroom at the different stages I described. What are some things I could do to help improve it and what other info should I give?
Images: https://drive.google.com/drive/folders/1hkMQQpVxGBBui0LsZnZHxL1ODCn40m1z?usp=sharing
Both nitrate and phosphate are undetectable but I am using the API tests which I don't think are known for their accuracy (especially the phosphate test), I've attached 4 pictures of the mushroom at the different stages I described. What are some things I could do to help improve it and what other info should I give?
Images: https://drive.google.com/drive/folders/1hkMQQpVxGBBui0LsZnZHxL1ODCn40m1z?usp=sharing