can I do multiple water changes?

[rowdy]

How many water changes can I do in a day?

My nitrite and nitrate levels were extremely high yesterday after doing my first water change. So I did another this morning, and it helped but the levels are still unacceptable. I want to know if it would be safe for me to do another tonight and either 1 or 2 more tomorrow depending on my levels. I really want to get the levels under control asap. The tank houses a f8 puffer and 2 black mollies.

[Pufferpunk]

As many as you need to do. Be sure to clean the substrate well, underneath all decor.

[bertie 83]

You can do them constantly, one after the other. I like doing this (I'm a bit weird). You can purge all waste out and give nice clean water. It's a bit pricier and takes more forward planning on a s/w tank though I can tell you lol, you gotta mix loads of water at your desired sg at your disposal

[Pufferpunk]

Just be sure to use Prime, every time.

[Welch4]

+1 to the above but as your brackish make sure not to raise the salinity more than .02 a week or you will risk destroying the benefical bateria in your tank and have to start your cycling process over again.

[rowdy]

Yeah I have been adding prime to all of my water batches. Anyhow. I did another water change today and my nitrites were 0 YAY! My ammonia is 0 and pH is 7.8. My nitrates are around 80. Do I need to worry about the nitrate level being that high?

[Welch4]

Yes. Once your tank's cycle is fully established your nitrate levels are your queue to do waterchanges. You want to keep these under 20ppm.