And it is always a good idea to test water, and to do partial water changes.
cryptocoryne is the genus, many kinds could grow well, wendtii (several cultivars ie red, brown, mi oya, etc) are common, 4-8 inches tall. Spiralis, retrospiralis
Hockey is the answer....
Looks like an SAE to me - I was having the same problem as you and I honestly didn't expect the SAE to do anything but gave it a shot. Well, the first