My fish tank water is getting really really green!
is this bad or good?....
Brandon, what do your water tests say? Ammonia, nitrite, nitrate, pH and temperature? What is your filtration like? If it's a flood and drain system, can you set the pump to cycle constantly for a while?
A partial water change is sometimes the only way to save the fish but water changes tend to set cycling back too.
Block out the light so the algae won't mess with the pH (causing diurnal swings.)
Tell us what your ammonia level is since high pH and temperature along with ammonia is toxic to fish.
Make sure there is plenty of aeration
and allow the system to finish cycling, pH will generally come down naturally.
If you do a water change due to ammonia or nitrite levels, you could adjust the pH of your top up water but lowering pH tends to be problematic if the water is really hard and bouncing the pH in a system is generally worse for the fish and bacteria than just letting it come down naturally.
Fish generally don't mind a high pH so long as it isn't causing ammonia to become toxic.