Light adjusting problem

gorapl · Nov 3, 2023

Hi All
I have a problem to adjust the lightening in my aquarium.
Aquarium is 52 gal (200 liters) with filter panel. The surface of water is (16x31,5 inch) 40x80cm, (18 inch) 45cm deep.
My lights are: 2pcs of Maxspect Jump Light MJ-L165 standard version and one of AI Blade - Coral Glow 40W
This is SPS/LPS and some soft coral tank. But only easy SPS no acropora.
Attached current lighting setup. I had more light schedule but I reduced it as my montiporas plate started to lose their colors.
Please advice if is ok or not.
I did ICP test. There is some parameters issue. I started one week ago dosing Fe and Jod. I'm not sure if the problem is light or only parameters or both.
Please help

Screenshot_20231103_131114_Syna-G Cloud.jpg

Timfish · Nov 3, 2023

Looks like your PO4 is low which can make corals very sensitive to light as it messes with their photobiology. FWIW .03 mg/l is the threshold level to prevent phosphorus limitation in corals, identified by researchers at Southampton University in England using corals maintained in an aquarium for about a decade. .3 mg/l is what corals are subjected to with upwelling in the ocean. .5 mg/l might be acceptable for some as acros have been shown to increase growth up to this level. .9mg/l is the level the Steinhart Aqaurium's ex situ sexually reproduced acro colonies are being grwon out with. Rich Ross's (who's part of the team at Steinhart) has his acro dominate mixed reef sitting at 1.8 mg/l, his tank can be seen at the beginning of his MACNA presentation on phosphate. You can see his current levels as well as some cool videos of corals spawning in his thread.

Rich Ross - Home Tank - guess the phosphate

This tank was built before r2r, here is a link to some links about the build. http://packedhead.net/home-reef/ Current test results: 03-17-2017 Ammonia (NH3-4) Good 0 0.000 - 0.050 mg/L 03-17-2017 Nitrite (NO2) Good 0.006 0.000 - 0.100 mg/L 03-17-2017 Phosphate...

www.reef2reef.com