Moved and lost control on my tank

A few months ago I moved from one town to another. At the first home I had my tank in my living room. This helped me make sure I kept up on my water changes and I would notice if something wasn't working right.
After I moved my tank ended up downstairs and was out of sight. I had planned to have it in a room with a pool table (it's a 24 gal. Cardiff tank so it's nicely tucked in the corner). Well it took me close to 3 months to get the table into the room, this also meant I wasn't ever in the room. I feed my fish every other day, but I ended up with the mentality of, oh I get that water change next time.
The poor tank didn't but 2 water changes in those 3 months. Before I was doing weekly changes. I have gotten back to doing weekly changes again, but I lost a few Zoas and the only Sps that I had in the tank. The 2 clownfish and blue/green chromis seemed to be just fine. I have had the tank for a couple years now but feel like I lost a lot of knowledge in those months I was not attentive. I have also never been bad to my tank and caused an issue like this before.
Has anyone ever had something like this happen or just had life get in the way and had to recover their tank? Is this going to be like having a young tank again, or will it recover back to its old glory?

Here's a picture of what I have going on in there now. Also a picture of what I had when I first moved in.


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I use a refractometer to test salinity. I tested my perimeters with Api twat kits. They seem to show things are ok, but they are getting old. I know there are a lot of opinions on test kits, but what would you recommend.


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Ok, thanks. I will get a kit ordered right away


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