Acro Tips dying.

[RFred77]

Hey y'all

I have an SPS dominated tank but I do have 1 frogspawn colony. Some of my acropora colonies tips are dying and I am completely stumped on what's wrong with them. Here is everything about my setup.


70 gallon tank (4 months old)

Parameters:
ALK - 8.9
CA - 420
MAG - 1320
Nitrate - 1.5
Phosphate - 0 (Hannah checker test)

Lighting - Radion Pro (60% intensity)

Filtration - bubble magus 5.5 skimmer, Bulk Reef Supply 2 reactor with ROWA phos and BRS 0.8 ROX carbon, filter sock.

I have one frogspawn and rest are SPS (tenuis, spathulata, milli, etc...

Dosing - 2 part doser with calcium chloride and the other is sodium carbonate (soda ash)

Salt - Red Sea coral pro salt mixed with RO/DI water.

Test kits - Salifert and one Hannah checker for phosphates.

Flow - ecotech mp40 and mp10



I threw on the radion and set my intensity at 60%. I checked the par and it is ~ 180 to 220 at the top of my first acro colony. I set it up about 2 months ago.

I just had a small temperature swing of about 2-3 degrees the other day and I fixed the problem but I killed a tenuis colony the size of a softball.

Anything helps, thanks y'all.

 

[dunc101]

I have seen issues in the past with acro tips burning when you have alkalinity swings (namely rising too fast). Do you know if you have had any alkalinity swings?

 

[RFred77]

I have seen issues in the past with acro tips burning when you have alkalinity swings (namely rising too fast). Do you know if you have had any alkalinity swings?

I haven't really, the most it moves is around .8 DKH in a week.

 

[revhtree Verified Admin]

Yep alk swing!

 

[revhtree Verified Admin]

Oh and welcome to R2R!

 

[RFred77]

Oh and welcome to R2R!

Ok what is too much of a swing? Oh and thanks!!

 

[glb]

Ok what is too much of a swing? Oh and thanks!!

It is a big swing. I had huge problems with this and Randy Holmes Farley helped me out on the reef chemistry forum. I try not to let mine fluctuate more than .2. I measure it every day now since I got some SPS.

 

[RFred77]

It is a big swing. I had huge problems with this and Randy Holmes Farley helped me out on the reef chemistry forum. I try not to let mine fluctuate more than .2. I measure it every day now since I got some SPS.

Waw ok got it! I'll defiantly keep that in check from now on!