STN or not enough light.

[Timbo13]

Hi all. Looking for an answer to my strawberry shortcake acro problem. I've had it for about a year. It's never really colored well but is still growing. It took about 6 months before it stopped plating and decided to grow upwards. It's always just kind of been white with parts of it red. In photo 1 I had a power outage about 8 months ago and it went white at the base but kept growing. Is it STN ? Or because I'm using an AI prime 16HD and the PAR would be low and causing it not to color? I have some acro frags coming the day after tomorrow and read that STN can spread between corals. Should I get rid of it?
Below are some photos, #4 was taken with an orange filter.

 

[Timfish]

Looking at the pattern of white vs color my first thought is lighting. However, alkalinity and nutrient issues may compramise a coral's photobiology making it more sensitive to light conditions. Having light levels (PAR) as well as water parameters and dosing regimens would help.

 

[vetteguy53081]

Hi all. Looking for an answer to my strawberry shortcake acro problem. I've had it for about a year. It's never really colored well but is still growing. It took about 6 months before it stopped plating and decided to grow upwards. It's always just kind of been white with parts of it red. In photo 1 I had a power outage about 8 months ago and it went white at the base but kept growing. Is it STN ? Or because I'm using an AI prime 16HD and the PAR would be low and causing it not to color? I have some acro frags coming the day after tomorrow and read that STN can spread between corals. Should I get rid of it?
Below are some photos, #4 was taken with an orange filter.

This may be a result of what is known as shading in which areas blocked from light have this lack of tissue but the pics are a bit radiant to confirm. Other causes are tissue loss are
- Alkalinity spike
- Temperature spike
- Salinity spike
- Low dissolved oxygen
- Poor water quality related with phosphate levels up to 5 ppm
- Change in water flow
- Additions of sand
- Changes in brand of salt
- Bad test kits giving faulty results
- Levels of minor elements such as Iodine, Potassium, Strontium
- Light intensity
- - Changes in water flow
- Addition of new corals
- - Pesticides
- Airborne Contaminants or sprays

 

[Koh23]

So basically, if anyone in 10 mile radius sneeze, your coral can react like this.....

 

[Timbo13]

Thanks for the responses everyone. I'm going to pick up a second hand radion g5 today and hope for the best.