ULNS a thing of past??

[Nereaga]

When I left the hobby 10+ years ago, the hobby was transitioning towards ULNS. Heavy skimming, under feeding, high flow, no sand, weekly water changes. Truth be told, the most successful system I had running was BB, high flow, Low nutrient, and heavy skimming 100g mixed reef.

So is it a thing of the past?

I know it depends on the type of system/reef you are wanting to run. But when I checked out, it was skimmer VS skimmer wars and the start of Mh vs LED lighting debate. I just don't see a ton posted about it as I remember *.

 

[hegeh]

Lol. I guess people read the good old threads. Good skimmer and high flow are still essential. But people have moved/accepting LED and i have not seen people debating T5xMHxLED for a while.. haha welcome back to reefing! [emoji847]

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[Uncle99]

Not a thing of the past but as you said, more in tune with SPS dominant regimes

 

[JPMagyar]

Lol. I guess people read the good old threads. Good skimmer and high flow are still essential. But people have moved/accepting LED and i have not seen people debating T5xMHxLED for a while.. haha welcome back to reefing! [emoji847]

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Lack of forum debate is not proof of acceptance.

 

[paal]

LED/T5/MH debates are still going on.
LEDs have come a long way the last 10 years, but if you truly want to provide the more challenging corals with the best light possible, a lot of people still swear by the old tech.

ULNS is not really as "hot" as it used to be.
I guess more efficient equipment over the years has lead to easier nutrient export for most reefers. Even to the point that many are now struggling with "too clean" systems: Dinoflagellates -threads are popping up like never before and it seems like people are talking just as much about dosing nutrients as they do about removing them.

 

[reefgeezer]

The numbers have evolved. 0 is no longer the absolute target. The levels are still low and depend somewhat on what kind of corals are being collected. Personally, my SPS tank does best when I can see just barely positive N & P levels on my test kits (Hanna ULR Phosphate/Salifert Nitrate) while feeding the tank heavily.

IMO, a lot of the problems encountered when maintaining low nutrients is the limitation of organic input or stripping of dissolved organics used to maintain those levels. I think the actual change in the hobby is that we've figured out how to maintain relatively low nutrient levels while not starving the system by limiting organic input.