Predator Soft Coral Reef Help

[Lil Puff]

Hi guys, just wondering if anyone has any ideas on why all my soft corals don't grow expect xenia (even gsp doesn't grow) and i don't have corraline algae. The tank is over 3 years old but during that time it has been moved and has been under hyposlanity for a month. It also used to have over 100ppm of nitrates. I have got them to 50ppm bt I can't get hem to drop further. On a plus side they aren't raising either. The tank is 400L with heavy filtration for the size of the tank. I also just added a rock covered with zoas and corraline from my dads mixed reef to hopefully seed the corraline. Below are all the specs of my tank. All the tests were salifert. Thanks in advanced!

Filtration:
Buuble magus filter roller
Mantis tornado 180 protein skimmer (600L - 1500L)
Aqua uv 57watt
Refugium with chaeto
Bioballs

Paramaters:
Nitrate - 50ppm
Phosphate - 0.25ppm
Alkalinity - 7.8dKH
Magnesium - 1260ppm
Calcium - 405ppm

Dosing:
50mls vodka and vinegar mix daily

 

[damsels are not mean]

and has been under hyposlanity for a month

 

[Lil Puff]

this was a few months ago. would the tank still be trying to balance out?

 

[Mr. Mojo Rising]

corals need light, flow, and nutrients to grow. You have nutrients, so can you tell us about the lighting and flow? Surviving, but not thriving, often turns out to be a low lighting issue. Pictures will help.

 

[Lil Puff]

corals need light, flow, and nutrients to grow. You have nutrients, so can you tell us about the lighting and flow? Surviving, but not thriving, often turns out to be a low lighting issue. Pictures will help.

I am running two pop-bloom RL90’s for lighting. they are running the same schedule as my dad who is growing sps like crazy in his tank but i will get the specs tomorrow. for flow i am running 2 jebao wavemakers and a jebao crossflow gyre. i will get some photos tomorrow morning. thanks heaps for the reply!

 

[Lil Puff]

corals need light, flow, and nutrients to grow. You have nutrients, so can you tell us about the lighting and flow? Surviving, but not thriving, often turns out to be a low lighting issue. Pictures will help.

i got some photos of my tank:
display and sump

my dads tank with the same lighting for reference.

Thanks for the help!