When I did mine, I was told to add 10%, since the blues impact the meter differently. This is second, or third-hand knowledge, so cross check that.
Just was skimming through this thread.... great tank Dennis!
I have 2 questions though, if you don't mind:
1. How are you even keeping those sponges alive? Everything I have heard says they are impossible to keep without an NPS system. They are looking great, not only surviving but seem healthy!
2. How does the Powder Brown behave in a 4' tank? From what I know, its a lot less aggressive, less neurotic, and less 'pacy' than the Powder Blue Tang. Think its fine in this size tank? Curious, because its one of the fish I really would like in a 120 I'll be setting up in the near future.
Thanks!
I've been playing around with the Apogee MQ-500 par meter.
The three radion pros are 16.5" above the water.
The yellow measurements are as close to the center of the tank as I could get when rock wasn't in the way.
The extra row of blue along the bottom were measurements taken close to the front glass.
This is the AB+ Coral Lab program and it's running at an overall brightness of 65%.
Thinking of upping it a little over time to get the upper tier nearer to the 300 mark.
But this is my first time using a par meter so open to suggestions.
Tank will be mostly sps and lps.
From what I've heard, mid-200's is the sweet spot.
This was my problem with radions. I thought I was blasting my corals with par. Then I borrowed a par meter from a friend, and my results were pretty similar to yours. Even with my lights at 100%, the par still wasn't where I had hoped it would be. I eventually ran all colors 100%, and saw some improvement. Although, I started getting a lot more algae growth. (Mostly cyano). My tank is Sps dominant, so maybe our goals are a bit different. I was hoping to have 500 at the top. I think the highest I saw was 300. That's with AB+ program at 100%, and lights about 11" above my water.
Moving along nicely. About a month into it, can you give us your opinion about the overflow design?
I am planning a 240g build (72" long), and wanted a full coast-to-coast external overflow. The tank builder I prefer to work with won't go over 24" for the external box,and that only gives me about 14" of effective weir after accounting for teeth, etc. Triton calls for 10x flow, which after all is said and done, would mean I'd have about 1" of water flowing over the weir of the overflow. Contrast that with a coast-coast, which would give me about 3/8" over the weir. Granted I would still get some skimming with the smaller box, but will it be enough?
I know you had doubts about moving from your coast-coast on the last tank to this Elos design. Any idea how much water you are getting over the weir vs. pulling from the bottom of the tank? Do you think you are still getting effective surface skimming? Too soon to tell?
Nice tank! I have followed all your build threads, and it always was a pleasure .
When you said the tank will be mostly SPS I was concerned about your PAR results.
Having proper T5 setup (which means recommanded for the tank volume) one should have PAR at least 800 at the surface (mine is 1100 for 130 gal cube), so I am afraid you may need to add three more led fixtures. Moreover the point with the light over the reef is to have it evenly spread over the tank, while leds, mostly like yours, are rather giving concentrated beam, so more units should deliver: primo more light, secundo: more spread . Just my 5c.
Thanks for the comments.
If I had 800-1000 par under these lights my coral would be fried crispier than grandma's fried chicken!
Take look at this article.
http://ecotechmarine.com/wp-content/uploads/2016/01/Ecotech_CoralLab_WP1.pdf
I agree with you on the spread but 4 lights would be the max over this tank. I think 3 will do it though since i have the extra height aspect. Already at 16.5" and can go higher if need be.
I see so many threads with people that are using metal halide or t5s, and it's seems like most have 500+ par (minimum) at the top of their tanks. I'm friends with Greg Carroll, and he had 3 or 4-400w metal halides over his 225g tank, and it was exploding with growth. If I remember right, he was getting around 700+ par half way down.
Do you think that much par just isnt necessary? Or do you believe led par is somehow different, and only 300 is needed with led lit tanks?
(This is all for Sps dominant tanks of course)
I don't see anything in that tank that requires higher par readings. I'm sure my par readings are lower than yours and I'm growing SPS just fine, need to work on phosphates but that's another issue. I have about 3 months left before I break it down, you're welcome to stop by. I think that rather than chase numbers, you should go visual, yes I know you had issues with slow growth in the past, but let me ask you this...
Why rush growth? unless you plan to sell frags. if the system's healthy and colorful isn't that good enough?