| | Yellowing old anubias leaves
Need advise with my anubias, noticed my anubias broad leaves started having yellowing o. Old leaves? I just added a coffefolia and congensis , what could be the cause? Ive read it could be lack of nitrigen? But when i tested i had nitrate of 40 ppm? Any advise? They are in my arowana tank. Should i dose with kn03? Or should i use fertilizer?