What color is the cloudiness?
White: the tank is cycling. Changing the water 100% will stop the tank from cycling.
Cycling is in terms of a nitrogen cycle: waste and uneaten food -> ammonia ->
nitrite -> nitrate. The white cloudiness is actually beneficial bacteria blooming.
The beneficial bacteria converts ammonia to nitrite and nitrite to nitrate. Only
nitrate is considered harmless to a certain amount for turtle or fish. Plants "eat"
nitrate, that's one way to get rid of nitrate from tank. The other is to change water
regularly. After the first nitrogen cycle, your tank water will become clear.
Green: algae. Algae is considered as plant. Read the description above.
