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A quote from Eric Borneman on feeding SPS corals, from
http://reefkeeping.com/issues/2003-11/eb/index.php
"Corals with small polyps do not necessarily require more or less light than those with larger polyps. The only real difference between corals with small polyps and corals with large polyps is the size of the prey they can consume. Many small polyped corals, such as Pocillopora damicornis and Stylophora pistillata, are highly photoadaptive and can be found in very deep water. The genus Acropora has more species than any other coral and, as might be expected, can be found in similarly varied locations. Species of Acropora are found in deep water and shallow water, high water flow and low water flow. Furthermore, corals with small polyps have been found in many studies to consume more prey than corals with large polyps (see Borneman's article on feeding corals in Reefkeeping 2002 for pertinent references). The belief that large polyped corals need to be fed more than small polyped corals is just wrong."
[skimmers remove coral food; scrubbers add coral food]
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Excerpts from "Our Coral Reef Aquaria - Our Own Personal Experiments in the effects of Trace Element Toxicity" by Ron Shimek
http://reefkeeping.com/issues/2002-08/rs/feature/index.php
"Trace elements in heightened concentrations are considered to be poisons, nothing more, nothing less, by every researcher examining them."
"With regard to arsenic (when found), copper, nickel, tin, and zinc, the average tank water must be considered as being polluted with heavy metals."
"The water from the average reef tank is clearly dangerous to the organisms put into it [because of too many trace elements]."
"What causes these excessively high trace metal concentrations? Initially, the problem occurs with artificial seawater mixes that have abnormally high concentrations of these materials [...] Also, there is inadequate export of the materials due to any number of causes, but including such factors as poor skimming, inadequate water changes, and inadequate biomass export. Finally, in some cases well-meaning, but ill-advised aquarists often add supplements containing unknown quantities of some trace elements."
"There are NO data that any trace element additions are beneficial, and for any trace element for which there are data, excess amounts are detrimental. No adequate test kits exist for the vast majority of these materials, and few supplements list their ingredients in a trustworthy manner. Consequently, it is prudent not to add any at all to a system."
[Scrubbers remove metals]
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Not much algae growth. I figure my PO4 and NO3 are so low there isn't much to feed the algae... Sound normal?
Lights are fairly new. Flow still 642 GPH on 11 inches.
I still massage clean the algae every week to get any oils off but there's not much to clean off. I have some turf matt that I don't peel off unless it just peels off itself.
180 Gallon 760W Mixed reef Bullet 2, Reeflo Dart.
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Well, I recall that your tank is not stocked much, which would mean you are not feeding much. And as you say, your N and P are low. So yes, this could mean little scrubber growth.
However, your growth should be all green hair, if your nutrients are low.
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Success Updates:
Coolhandgoose on the scrubber site: "Since I installed the new light two weeks ago my nitrates have gone from 20 to 0. The cyano in my display is now starting to disappear."
Desert_Fishy on the SWF site: "I started my 75g reef 5 months ago (2nd venture w/SW) and decided to start up with a scrubber and no skimmer due to this thread. All I have are powerheads, lights, scrubber and a heater. My water readings are perfect, corals are really flourishing, fish are happy and I spend 10 minutes a week cleaning the algae off the scrubber - although that is becoming a bigger and bigger job. My only problem now is that copepods, feather dusters and some other small pink bug-like creatures that live on the glass are multiplying out of control. I have feather dusters everywhere!"
Toddo on the MFK site: "This is my 125 freshwater tank with medium bio load. I have an XP3 with Biomax/mech pads, and this scrubber as the only filtration now. Its been 12 days with just the scrubber for nitrate control. Nitrates and ammonia are still at zero. No water changes. This is significant, as my well water is 35-40ppm Nitrates. It grows enough algae to need weekly cleaning now. I had a specific freshwater requirement for low to no nitrates, and I have met that, using my scrubber. It was properly designed and built using info provided, and is now functioning as expected."
DeathWish302 on the RC site: "The turf scrubber slowly drove out the cyano, and has been amazingly processing EVERYTHING I have thrown at the tank in regards to food."
AlgaeNator on the scrubber site: "I have been running a version of ATS for about 2 months, and have been skimmerless for 4 weeks now, and am very happy with the ATS concept and performance so for. I have been running my prototype Victory Scrump for about 3 weeks now, to prove the concept and it's working VERY well. My corals are healthier than EVER, Two of MY RIC's that were dying going clear, are now SPLITTING after removing the skimmer. Im amazed actually at how well my other softies are doing too. In my case, I might not be typical though, as I think i was OVERSKIMMING my tank with my larger skimmers i build and sell, removing the good stuff with the bad"
Manuelink on the scrubber site [from spanish]: "with algal over 4 months without water changes, no skimmer, no additives anything, just food and my corals growing like additives. the coralline algae and is infested by all sides, that speaks of good levels of alk and calcium. is a wonder this invention"
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