Hi Redtech,
Lowering Ph is very difficult. The problem is you want to find a way to control it so you don't have wild swings. That will kill your fish. What I would do is research what kinds of fish you can keep in your type of water, and go from there.
One suggestion is the Rainbow fish. They can tolerate pH up to 8.5. But 7.8 being the suggested level.
Here's a site I found. Home of the Rainbow Fish. It looks like they have great information.
http://members.optushome.com.au/chelmon/
I would suggest getting an
RO unit but think if this is a first time set up you want to make it as easy and as pleasant for yourself as possible. RO (
reverse osmosis) unit.? They are expensive.
Try to get a reliable test kit. (not strips) And really find out what you're working with. (you can buy them online as well)
Best of luck.
Jess