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Leaving it at 7 can be dangerous IME.
Calcium,Mag,Alk.,PH, are the most important IME.
As Evolved said get rid of that skeleton.The red ones are much more difficult to eradicate.
Your Mag. level should be roughly three times your calcium level.So if you are aiming for a 400 cal. Mag. should be around 1200.
Is the venturi original equipment?I know the pump is not. Heres a link for the spare parts. TUNZE GmbH High-Tech Aquarium Technology: Product Search
Its just some snake oil that has vitamins and some sort of PH stabilizer.It is not a tapwater conditioner.
Whenever someone says I need to get in shape I remind them that round is a shape.lol
Flex tubing will usually give you less restriction then hard plumbing.;)
Very nice pieces.You will need to feed that Gorgonian ALOT to keep it alive.Lots of random flow will also be needed.Good luck with them.
Its called a venturi the size and shape make a huge difference in the amount and size of bubbles.Which Tunze skimmer is it??
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