SPS slow growth ?

[Yanir34]

Hello guys , my SPS tank is 1.5 years old .
it is full stocked with SPS and some LPS.
I got the feeling that growth rate of SPS is slow....

tank is 500 liters volume , sump is 200 liters .
I'm dosing Red Sea liquid solution for Alk ,Cal and Mag. also dosing red sea trace elements.
my dosage daily is :
64 ml Alk
30 ml Cal
10 ml Mag
5 ml of trace elements

Parameters are :
salinity 1026
Alk 8.1
Cal 420
Mag 1280
no3 is 5 ppm
po4 is 0.02

Lighting is ATI power module 10×54w and 2 Kessil 360x tuna blue .
2 bulbs on for 9 hours , 8 bulbs on for 7 hours.
kessil are 12 hours (3 hours of sunset, 3 hours of sunrise) .
Lights are hang 27 cm above water surface.
PAR levels are 200 at the bottom , 500 at top of the rocks.

4 MP40's pump on 60%

here some pics of same corals 6 months ago ,and today.
what is your opinion ?

 

[chipchipbro]

imo the growth rate is not slow...
The growth rate in my tank is slow. I wish I had a growth rate like you, honestly.

 

[Tonycass12]

Your sps are growing just fine. Can they grow faster? Maybe. But is it worth you starting to tweak your system to get faster growth, probably not. Your corals are looking great and have a good amount of growth for just 6 months.

 

[FrugalReeferJon]

C’mon man, stop showing off. If you consider that growth slow then the growth of my SPS is like super slow.

 

[Yanir34]

C’mon man, stop showing off. If you consider that growth slow then the growth of my SPS is like super slow.

I'm not showing off....I really think that it is little but slower then it should be.
thanks for uour opinion anyway

 

[Gtinnel]

For a second I thought you were being sarcastic, because your growth rate looks fine to good, IMO. However if you are trying to increase your growth rate then you didn’t list one of the most important parameters, pH. Increasing pH can have a significant impact of stony coral growth.