SPS tank - Switch from T5 to 2x Kessil A160EW - Thoughts?

[xenon]

Originally Posted by Myka

Holy crap! Most people use nitrate dosing to achieve trace amounts of nitrate or maybe up to 5 ppm, not 25 ppm! Why did you go so high? How long did you elevate it for? I dose Sodium nitrate to achieve 0.2-0.5 ppm nitrate.

I did it slowly and noticed very little difference at the 5ppm range so I kept going until I could see a real difference.

[ashr]

I have always had success growing SPS under T5 but wanted to try something new for this nano tank. If I do not find great results within a few months I was thinking of adding a 2 bulb 24” T5 fixture with ATI bulbs.. Just to add some extra light if I need to. I think that would be fine to grow my SPS. Tank is only 13” wide so it would be tough to add more than that.

Keeping your parms close as much to perfect is key I have found for color in my SPS. Time will only tell..

[Myka]

Originally Posted by xenon

I did it slowly and noticed very little difference at the 5ppm range so I kept going until I could see a real difference.

You will only see a difference if your tank was nitrate limited to begin with. If your inhabitants used up essentially an equal amount of nitrate as was being produced, then they weren't nitrate limited. You don't need to have lots of nitrate.

Have you heard of the Redfield Ratio? "In 1934, Alfred Redfield discovered that the ratio of carbon to nitrogen to phosphorus is a nearly constant 106:16:1 throughout the world's oceans, in both phytoplankton biomass and in dissolved nutrient pools."

Nitrogen isn't the same as nitrate (some test kits do measure nitrogen though), but it reminds us to bear in mind the relationship between the two (or three). This points to the fact of your gross overdosing of nitrate.



But I digress, this thread is about light. I'm still on the fence about that. I have seen many tanks in person under LEDs that had amazing coloring, though it was always limited to the top side of the branches since LED won't "wrap around" the coral like T5 or halide light does. IMO, it's easier to achieve good coloring using T5 or halide, but it's certainly not impossible to achieve such with LEDs. The proof is in the pudding. It has been resoundingly proven that it is possible.

[Doug]

I can't argue with halides for sps. The corals I get from Canada Corals are stunning. And recently visiting another reefer in Calgary.

However. My sps in the 50g before trying the upgrade failure were very nice colour. Could not ask for more. And good growth. I was running a pair of Evergrow 2040,s. Thus the main reason I ordered another Evergrow 2080 for the 50g thats getting set up again.

II did look at two different used halide systems but in the end, Im happy with my decision.

[jordanc_17]

Originally Posted by Myka

I have seen many tanks in person under LEDs that had amazing coloring, though it was always limited to the top side of the branches since LED won't "wrap around" the coral like T5 or halide light does. IMO, it's easier to achieve good coloring using T5 or halide, but it's certainly not impossible to achieve such with LEDs. The proof is in the pudding. It has been resoundingly proven that it is possible.

I have also noticed the same thing in regards to my led's not wrapping around the branches. I think its because the light source is so concetrated with led, while halides and t5 have large reflectors on them. Maybe we just need wider led fixtures to get better front to back coverage?

[Scythanith]

I have always wanted to try to aim a kessil upside down into a nice MH reflector

[ashr]

So I got all my corals in the tank yesterday and will post my findings. Right now I have it set to max 35% intestacy for a few hours. I will either turn it up or down with in the next few weeks until I get a better idea how the corals are looking. Pictures to come!