tank parameters & test kit

Over the past few weeks I've been been battling something causing poor health in some of my corals. Some have died, some are bleaching and some have bailout. I'll start from the beginning. Somehow we had a Salinity spike (regardless of having the ato). Got that level back down to 1.025. Gave it...

I have an 8 gal saltwater reef tank that has been running for about 6 months now, I want to ensure what the appropriate water parameters for saltwater aquariums are since I would like to start adding things to in soon. I also have a question about which saltwater test kit is the best to get.