What's happen to my monti ?

[Fred]

Hi,

i had those 3 monti since 6 months, they came from 1/2 to 1 inch frags, they were growing good, but 2 days ago i saw start a sort of bleaching. Strangely, it's happen only on 2 of them, 1 in the middle is ok. the red below seems to bleaching everywhere , the green on the top bleaching only on the edges, and the one in middle is doing fine with good polyps extension. What can i do.

i don't get it, what can explain this .

Thanks for your help.

 

[Fred]

A. Total water volume ( Please include sump, etc.) tank 50 g + sump 20 g

B. What are your parameters? ( CA, ALK, PO4,Salinity, etc.) Ca 460 , alk 7 , mg 1500 , salinity 1025 , temp 77

C. Type of lighting. Please include age, watts, and bulb/ballast name. LED

D. Filtration method (Skimmer, GFO, DSB, etc.) Skimmer BM c7 , 2 units chemi pure elit, 200ml npx bioplastic

E. What types of corals do you keep other than SPS? lps and soft

F. How long has the tank been running? 3 years and half

G. What are you dosing? Dosing schedule? C-balance, 5ml a+b daily

H. Which brand of salt are you using? Red Sea Coral pro

I. What brand of test kits are you employing? salifert

J. What are you using for CA/ALK supplementation? C-Balance

K. What are you using for flow? (Pump names, how many, placement, etc.) 1 mp10 wes , 1 jebao wp 10

 

[SkipperTheSohalTang]

I'm thinking alk. 7 is a bit low IMO.