To all of you experts out the

Recently change the light on my 29 G tank from 2x40 wt to 55 wt from Ah
supply
add more plants and fish in about a week water start turning green.
My water have 0 ammonia, nitrates about 15
wary soft and sudden change in Ph from usual 6.5 to 7.3 .Just before lights
change did about 30% water change and add a florapride
Any suggestions would be appreciated

Alex