sorry to add to your woes, but the plant you got looks like Cabomba. it's not truly a low-maintenance plant in that it requries high light. Otherwise it starts to rot and the little leaves fall out everywhere. I'm having problems with mine and I have a plant-geared tank (light, ferts, liquid carbon). In my experience, anything with tiny needle-like leaves is high maintenace. I would suggest some nice Anachris. it's cheap, hardy, and a great oxygenator (grows very fast with little need for anything).