I bought several anubias from petsmart sometime in December I think. I bought a group of nana and 2 larger ones I don't recall the name of. The last big one to 'survive' had yellow leaves. I removed it tonight and the rhyzome was mushy, white and smelled literally like animal . It literally just came apart in my hands. Why are my anubias dying?? I give them seachem excel, flourish and iron (from a 'plant pack' seachem sells). I have a full spectrum light that I don't know the full specs of. The tank is a 10 gal with a betta, nerite snail and some ghost shrimp; plants are frogbit, hornwort and moss balls. Also dealing with cyanobacteria. It is possible they get too much light altho they are shaded somewhat by the hornwort. This dead got much more light than my nana. My last 2 nana are doing well and growing new leaves. I am by no means good with plants like I am with fish so I want to correct this before more anubias die.