half my corals look bad / die off

[bmkid1997]

Hey all, wondering if any more experienced than myself might have an idea of why some of my corals are looking bad / just straight up dying. My tank is 6 months old, all live rock start 50 gallon. My parameters are as follow:
Alk - 7.6
calcium - 400
Phosphate - 0.08
Nothing strikes me out of range, and I do the same weekly maintance (10% WC, change filter floss every other day, blast any detritus around to be picked up). All my corals are picked up from a local guy who trims them from his display. half are bad, the others are showing great color and starting to encrust the rock. Kinda at a lost if its something I may be doing, or just what happens sometimes!

 

[sculpin01]

Send an ICP, dip the bad ones and look for parasites, shut off amino dosing (if you are doing so), post pictures.

 

[Charlie’s Frags]

Looks like your Po4 has dropped significantly in 4 weeks
https://www.reef2reef.com/threads/sps-over-reacting-or-let-it-play-out.894921/#post-9939555Did you start using gfo and nopox?

 

[bmkid1997]

Looks like your Po4 has dropped significantly in 4 weeks
https://www.reef2reef.com/threads/sps-over-reacting-or-let-it-play-out.894921/#post-9939555Did you start using gfo and nopox?

Nope, I havent done anything to lower it. I thought about it but decided against; Ive overused in the past and didnt really want to go that route. Im not sure if maybe I had false readings from hanna. First was 0.00 and next was 0.08. Only things im dosing is alk and calcium

 

[Charlie’s Frags]

Nope, I havent done anything to lower it. I thought about it but decided against; Ive overused in the past and didnt really want to go that route. Im not sure if maybe I had false readings from hanna. First was 0.00 and next was 0.08. Only things im dosing is alk and calcium

Icp and check for pests.

 

[Bph]

It sounds to me your tank may not be mature enough just yet for SPS. It took me 8 months to a year before I could successfully keep SPS in one of my bare bottom system.

 

[bmkid1997]

It sounds to me your tank may not be mature enough just yet for SPS. It took me 8 months to a year before I could successfully keep SPS in one of my bare bottom system.

Might be, I just wonder the difference when starting with everything fully established vs obviously fresh start

 

[sculpin01]

In my opinion, it’s nutrient levels that cause failure in young tanks, either too high or too low. I opt for twice weekly nitrate and phosphate checks with targets of 10/0.10-0.15. Once the tank becomes reasonably stable in this range, you are probably good to go.