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I would start out with fish but I would eventually like to do corals and I don't think I'll start with sps just because, I'm just beginning and don't want to kill everything .It depends, are you keeping fishes only or corals? If corals, do you plan to keep SPS?
Is there a Hanna checker for that? I've looked at the alkalinity and phosphorus ones and planning to get them just so there easier for me.Nitratesthe end result of a tank cycle when newly set up

I only use hanna for calcium and ALKIs there a Hanna checker for that? I've looked at the alkalinity and phosphorus ones and planning to get them just so there easier for me.
Thank you this helps a lot!For me the order of importance
1) Salinity - Obvious - keep stable. Check and double check when you do water change and make sure top-off is not causing it to fluctuate
2) Alkalinity - Again keep stable; can fluctuate over time and causes problems with coral health; fish don't seem to mind
3) Phosphate - Causes all sorts of nuisance algae problems
4) Nitrate - Keep in check; fish don't seem to mind
5) Calcium - May experience poor coral growth, but I don't think it causes death
6) Magnesium - same as 5
Fish only is less critical, I would say 1,3, and 4 are the key parameters. Really just 1 with regular water changes is probably good for fish only. The other two you can probably get indications by looking at the tank.
The tank is brand new I'm in the process of the build I just ordered my sump with the Black Friday sale. I have a 125 gallon tank that I would love to have corals and fish.Never a dumb question but a lot depends on your plans for the tank. Will you have just fish or are you planning for corals? Is the tank brand new or is it well established?
It always a good idea to be familiar with the basics;
Salinty 1.026(corals) 1.021-26(fish)
Temp 77-81
If your planning coral:
Alk 7-11
Calcium 390-420
Phosphates <.03
Those are the majors that almost every one test for. Some people test for anything they make a test for but water changes usually take care of the lesser elements.
I'm sure more people will chime in with other things but a good saltwater book might be the best place to get started.
about this, im wanting to buy a 12 gallon nano tank. im going to end up putting some soft corals in there i wanted to know what chemistry ill need to keep track of but its a bit confusing, lets say i so 20% water changes weekly then what test will i need to do?For me the order of importance
1) Salinity - Obvious - keep stable. Check and double check when you do water change and make sure top-off is not causing it to fluctuate
2) Alkalinity - Again keep stable; can fluctuate over time and causes problems with coral health; fish don't seem to mind
3) Phosphate - Causes all sorts of nuisance algae problems
4) Nitrate - Keep in check; fish don't seem to mind
5) Calcium - May experience poor coral growth, but I don't think it causes death
6) Magnesium - same as 5
Fish only is less critical, I would say 1,3, and 4 are the key parameters. Really just 1 with regular water changes is probably good for fish only. The other two you can probably get indications by looking at the tank.

