PAR Readings - Throughts?

[elfloyd]

I'm new to measuring PAR.... but I think I may have a problem. I picked up a BTM3000 PAR sensor and did three quick readings:

(1) Out of water, 4" below light source = 503 - 548

(2) In water, 14" below light source = 199 - 209

(3) In water 26' below light source = 95-99

The 200 reading mid-tank may be OK, but I don't believe 95-99 on the bottom will support anything except some softies.... definitely not clams.

I'm running a standard 72 x 24 x 24 tank: Three four year old RadipLED Onyx fixtures with 2 x 80 T5 supplements (old bulbs).



Thoughts?

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[ecoreefguy]

You will be surprised . I’ve kept derasa clams at around 50 par without much issue. Green birdnest, pectina, most chalices . If you have the space , I would try different species and move them up as needed.