How frequently do you make water change?

[mrblur]

now i am doing 20% water change once a week.

i am using Coral life salts.

is it too much ?

and after the water change, do i need to drop anything to make it stable

anyway my tank is 1500 L

thanks for your advise

[fongster]

that is a big change being 300L per week

10% weekly or a 15% fortnightly is actually enough provided that your water parameters are good, the change will replenish elements such as calcium and carbonates used up by coral. however you will need to test to keep up with changes, test kits such are calcium, alkalinity, magnesium is needed if you are keeping hard corals.

you can add in trace elements and iodide to help the corals in general, but not absolutely required. Some would recommend adding a cap full of eco-bact water conditioner, not necessary if you have sufficient live rocks and substrate.

important to keep tank ph and alkalinity stable, avoid major fluctuations.

[jamomatt]

I kowtow to you... How you manage such a big amount of water change man...

Mine 400+l I already lazy to do changes liao. At most 1 time do 5%