Whats Wrong with my Cabomba?

Agree to little light. What happens is the plant races toward the light to get enough to keep it growing, hence the fast upwards growth and space between "leafs". With high light, the plant won't have to race towards the light to get enough, it willbe able to grow normal at a lower level with sufficient light.
 
Hmmm.
OK, that makes sense. I do remember teading that now. I took these plants from my 10 with 4.6 WPG.
I thought my PCF's were losing their potency anyway.. time to add 2 more!
 
AquariaCentral.com