Chaeto keeps melting in my ARID reactor

[EricLibs]

I've been running an arid n18 since they first came out years ago and at first it worked flawlessly growing chaeto like crazy. A year ago I moved my tank to a new house which caused a small cycle and since then I haven't been able to keep chaeto growing. It'll grow for a few days and then it inevitably melts into a big ball of mushy slimy algae. My system is as follows....

75G display mixed reef
15G sump
Filter socks
Skimmer
N18 in sump plumbed off return
Weekly 15G water changes tropic Marin pro
Dosing ESV A&B 13ml per day
Alk 9
Ca 460
Mg 1370
No3 between 5 and 10
Po4 between .02 and .05
Moderately stocked tank
fed lrs frozen food daily no flake or pellets
Most recent Triton test is as follows
Reactor lights are on 12 hours opposites display lights.

As you can see in my Triton analysis I'm lacking some Trace elements like manganese but my iron is a tad high.

Any thoughts and comments are much appreciated

 

[Larry L]

@AlgaeBarn

 

[roberthu526]

Are you carbon dosing by chance?

 

[AlgaeBarn]

How heavy are you skimming? Can you try dialing that back?

From a trace element perspective, I would recommend Mo, Mn, V.

 

[Juan Andrés Botero R]

B12 could be the limiting factor!

 

[Juan Andrés Botero R]

B12 could be the limiting factor!

How to Optimize Chaeto Growth - ReefBum

Sometimes it can be tough to keep Chaeto alive for nutrient export. Here are some tips on how to optimize Chaeto growth and to prevent it from crashing.

reefbum.com

1. Dose a B12 Supplement – Some anecdotal evidence suggests that B12 is an important vitamin for Chaeto growth. I recently started dosing Vita Chem from Boyd Enterprises
   
   , which contains a vitamin B12 supplement. This may be a limiting vitamin for many organisms in the marine environment…..not just for certain algae. Bacteria are the main producers of available B12.²³

 

[Subsea]

Nutrient recommendation for phytoplankton culture include B12.

 

[Juan Andrés Botero R]

Do you have a UV turned on all the time? Note this.... UV destroys cobalamins (also called vitamin B12) in solution. May be that is the cause of the chaeto melting!