Mine is getting green water too...
1) Do u mean just off the lights for few days and it will clear?
2) Will it affect the fishes in complete darkness for days?
3) I have some java ferns, nana, frogbits etc..Will plants get unhealthy and rot?
4) In future, a lower wattage light will be preferable? Wat r the precautions?
Sorry for the noob questions...