Recommended corals for lower temp reef?

[Dogshowgrl]

I have a 60 gallon cube seahorse tank. I had the goal of a softie, NPS tank, but I have found several corals that never adapted to the cold water and faded away until I pulled them and put them in my mixed reef.

Tank has been up since March.
Mars Aqua led light
Temp: 70-72
SG: 1.027
Ammonia: 0
Nitrite: 0
Nitrates: very high at 50 (it is dropping, added biopelets and sulfer denitrator recently)
Ca: 460
Mg: 1300
KH: 8

Currently stocked
2 finger leathers, GSP, 9 photosynthetic gorgs, 4 NPS gorgs, 3 toadstools, pulsing Xenia, tree sponge, pom pom macro. I am about to add some more macros in the next couple months.

I have added clove polyps, mushrooms (multiple species) and, zoas, but I always have to pull them before they wither away too much.

I have 6 seahorses, one Multibanded pipefish, one mandarin (I have cultured pods for several years now,) few trocus snails, one blue coral banded shrimp, margarita snails, 2 feather dusters, and a gold and black brittle star.

I also run red sea carbon, Purigen, GFO, filter socks, skimmer and WC 30-40% weekly due nitrates.

I feed CA and Hikari mysis twice daily, reef nutrition ROE, and oyster feast once daily. And live cultures of nano and isocrysis phyto fed every other day.

I am looking for non aggressive, hearty soft corals. I have a cabbage leather coming out of QT soon, it will be my first so idk how it will do, fingers crossed. The tough part is I only have one chiller so I can't slowly accimate them to the lower temp and even with fans my qt is in the workshop at sit at 79°F.

I am not adding to my tank until my nitrates are better but my QT takes plenty of time and I still have to order them from my LFS. I am very picky do I am looking at about 4-6 months before they ever come in.

Any suggestions?

http://uploads.tapatalk-cdn.com/20160906/516445cbb392a87e5e6181dbc92506cc.jpg

[Dogshowgrl]

Nothing? I get it, it's a tough one. I work at a LFS, and I am still stumped. The HA is getting much better, but I don't trust it. Lol. Qt is setup and empty.... ;) Think I will try zoas (again) and a nepthia.

Any suggestions on what color I should add?

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[JL.Chev]

How do you like those lights? I have the same and run them at 50 blue and I'd say 35 whites. The fans are loud once you go brighter. Tank looks great. Maybe try a blue toadstool.

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[vlangel]

I don't think the temperature is the problem with the mushrooms, clove polyps or zoas because my seahorse tank is also 70-72° and has those coral. Maybe its the varieties you have tried? My mushrooms are a plain large greenish brown very textured mushroom. My clove polyps are blue clove. Actually my palys do better than my zoas.
By the way, your tank is gourgeous.