CageUK
Fishaholic
As Ben says using tap water is a personal thing. This is an issue that will be hotly debated as long as there are marine aquariums.
It will be very dependent as well on where you live/the quality of water that comes out of your tap. My tap water is quite high in nitrates (haven't tested it for phosphates) and I wouldn't consider using it except in dire emergency. RO all the way for me.
If you want to use it for fish only then you should be fine but just keep a close eye on your nitrates and phosphates otherwise you may find yourself battling to get rid of hair algae etc.
It will be very dependent as well on where you live/the quality of water that comes out of your tap. My tap water is quite high in nitrates (haven't tested it for phosphates) and I wouldn't consider using it except in dire emergency. RO all the way for me.
If you want to use it for fish only then you should be fine but just keep a close eye on your nitrates and phosphates otherwise you may find yourself battling to get rid of hair algae etc.
