I've never bothered with adjusting the KH. Of course I'm more interested in the plants rather than the inhabitants. It's not necessary for the plants. So basically you could remove the coral if you're not keeping something that REQUIRES a specific KH/PH.
The bubble rate seems awfully slow for a 700 liter tank. Generally, a PH drop of 1 is about right. You can use a KH/PH CO2 chart or calculator to get an idea of where you're at. Those calculations are based on carbonates being the only buffer which it's not. This means the calculated CO2 level will always be higher than it actually is.
It can take a few days (or weeks) to get the CO2 levels adjusted initially. The best method is to watch your fish. Adjust a little every day until you see signs of distress. Then reduce the bubble rate back to the previous setting. That would be your maximum safe CO2 concentration.
Thanks for the info
I have upped the co2 on the aquarium.
I came home from work today and looked at the drop checker in the tank it was lime green.
So i am thinking 30ppm of co2 great.
So i thought i would test the KH of my aquarium water.
I think it was KH1 as the first drop of KH liquid turned the water yellow, very pale but still yellow.
My PH is 6.5 ish and then KH 1 gives me 7.4pppm of co2 in the aquarium.
How can this be if the drop checker is lime green ? i thought a lime green drop checker was 30ppm of co2.
Am i right in thinking if i took the bag of coral gravel for the aquarium the PH would rise ?
I am sure i put it in there to lower the PH as it was 7.5 to 8 a while ago as we have very soft water in my area.
I have a community tank with no difficult fish to keep, so taking the coral gravel out would be Ok.
Maybe i should keep a diary.
God this co2 lark is baffling me.