Welcome!
So, just to recap for everyone...
You tank has been set up for two months
You're not confident in you lights, but not sure if that's the problem
You use a refractometer and API kits
Two clownfish
You parameters are
Salinity 1.024,
DKH 6.7 (120)
PH: 7.5
Nitrite: 0
Nitrate: 0
Calcium: 500
Ammonia: 0
Phosphate: no test kit
Magnesium: ?
I agree with most that euphylia are a tough first coral. Can be no issues, can be very tempermental.
That said, yours don't look like they're dying outright, just very unhappy. I think you'll be happier with mushrooms, leathers, and some other easier corals to hold your interest for a few more months while the tank matures.
I'm five months up the road from you and had a very unhappy frogspawn that just decided to get over it and really open up again. Hopefully they just blossom, but it might be months of patience.
A full-tank shot would really help. It looks as if they're already mounted on the rock structure. Typically, you'll find them mounted down low in the tank. Too much flow will cause them to shrink up to protect themselves, but they'll do that for pretty much any reason.
If it were me (and I'm no particular expert.. lol) I'd put them in a sheltered spot where you're sure they're not getting too much flow. I'd adjust my alkalinity up to 8-9dkh, reduce my skimming or export (details on how you filter would also help) and feed the tank more until you get detectable nitrate and phosphate. Adding a couple more fish would help with that too.
Short to medium term, you'll need to be able to test phosphate and magnesium.
Medium term - I'd suggest renting a par meter and mapping out your tank so you're sure these, and future, corals are in a proper spot. If you thought too much light was the issue, I'd move that to number one, but a marginally too weak of a light isn't as urgent as chemistry and feeding... IMHO.