salt placement
 

If i need to adjust the salinity of my tank, where would the best place be for adding it; right into the display? into the over flow? or in the sump??

i thought with evaporation my water would stay a fairly consistent number but I have noticed it dropping some what over a week to 2 weeks.

Higher salinity water change, or slightly salty top-off water...but your salinity shouldn't typically be dropping.

Maybe the skimmer is producing too much wet skimmate?

If you have room like I do, just add some extra aged SW to the sump. Through evaporation your Sg will rise, giving you a slower elevation rate

As for your Sg dropping
It's possible it's dropped as you have added more FW than you thought, or your skimmer is taking it out and being replaced with FW from your ATO

Maybe put a piece of masking tape on the outside of your return section and mark it with a pen or such
Now you can keep an eye on your level

Calibrate your Refractometer to be sure it's all good. Then, before a WC, test your DT water. This will let you know if you need to replace the same amount of water, or adjust it to compensate for a swing in Sg

You shouldn't add salt directly to your DT or probably your sump for that matter.

Mix up some salt water and like the previous person said add it through you top up procedure or do a small water change and some water with higher salinity that the current DT level.

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I am not entirely sure that i have my skimmer fine tuned properly. i have it set to the max amount that it can skim.

is it possible that it is taking salt out of the system??

I just tested my collection cup and it reads about 1.015
I dump about 500ml per week max when it's skimming too wet
Closer to 250ml/week when it's working best

If you're dumping your cup lots, that's where it's going

What is your salinity at?

If you have no fish or corals you can just put some in or you can stop topping up till it catches up to the salinity you want.

without much of a bioload your skimmer probably won't produce much skimmate. It's also strange your salinity is dropping. Not that it matters much but out of curiosity, what salt brand are you using.

Also mix your saltwater solution in a different container/bucket/reservoir and add it after it's had a chance to fully dissolve. Place a maxijet in your bucket to do the mixing for you.

i am using instant ocean.

my bio load is small. some zoa's a couple of cardinals, one blenny, one goby, one sea hare slug, and a host of CUC

i have seen a cup or more a day in my collection cup.

my salinity was sitting at 1.026 for the longest time then recently dropped to 1.023 (i know it is still in a decent range but dont want it to drop off much more)

I will keep an eye on it and may be pull back on the skimmer.

I have been topping with RO and seems to be topping up a lot lately (i assumed it was the dry winter weather)

All very good things things for me to check. thanks for the advice