Can I ask you why you would change water once or twice a WEEK? I change mine every 2w doing 20% when I do. I prep the water 2 or 3 days in advance by adding salt and mixing/heating for 24-48 hours. I see no need to light your change water. I don't filter mine either, just use a power head for mixing purposes. I prefer to use RO
but if tap is working for you for now that's up to you.
How long has your tank been up and running and how are your Ammo/trite/trate readings?
Can't help you with the bio wheel.
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