A couple of things

[Gringos]

I got myself a TDS meter for my ro unit. When will I know when to change my membrane. Readings 35 going in and 0 going out.

I opened up a new bucket of instant ocean salt mix and mixed my first batch of salt with it. So I did a couple of tests. Alk 10.9dkh, PH 8.2, Ca 380ppm. Is it normal that the ALK is so high? Should I test for anything else before using the salt. I keep reading about bad salt, how would I know if mine is bad. Plus there is a bit of caking in the bottom.

On to the good stuf. I just got myself a new fish. Just what I wanted, went back to LFS and there was the copperbanded I had seen this weekend. Still looked good and eats mysis. So I got him in my qt and put a bit of rock with feather dusters on it. Safe to say he ate them all, so I gave him some shrimp and he ate them too. I had to put him in a 10g for now, having problems with my 30g. But if all goes well I think I will put him in my display in a week. Because he looks cramped in there, barely moves during the day. But when the lights go out, hes all over the place. I read they were more active at night but this is not what I expected. Can I expect a more active fish in my 125g? Would he benefit from moon lights?