Its been well documented that algae will grow on a reef if the grazing fish population is reduced beyond a certain level. Many macro algaes also produce chemicals that will clear areas of reef around the algae. The idea that corals "need" a low nutrient environment is a myth. Corals evolved to grow in the same environment as most algaes. Your corals will thrive under many levels of nutrients but the system must keep the nutrients mobile so that one component of the cycle doesnt become locked in a "sump" As long as you keep all of the nutrients mobile and dont allow any single component to freeze and build up then your corals will be fine. As long as people continue to strive for 0 nutrients instead of striving for a system that will reduce and cycle all of their nutients through the entire cycle they will continue to have problems in the long run. Look at my pics and videos if you would like to see a successful high nutrient system.
Hey Dog:
How high are your numbers? I am in a similar situation. My PO4 can run between .08 and .12 on the meter, and NO3 can run in the high single digits to 10 on the LaMotte. My colors look great, and I have no nuisance algae either. I have insane flow in my 180 all SPS tank. 4 MP 40s, 2 Tunze 6105 and 7 modded tunze nanos across the back wall. All in all the flow is at least 20,000 GPH. I run 2 TLF reactors w/ GFO 24 X 7 X 365. Running 6 AI Sol Blues for light.
I do have a tang army in my tank w/ Naso, Sailfin, Powder Brown (who nips SPS!), Kole and Hippo, so algae is kept in check by these guys I would think. I also have a bunch of angels; Regal, Juvy Emp, Flame, Lemon Peel, Vrolik's wrasse, and 9 green Chromis. I would consider this a fairly high fish load, and I do feed daily w/ Freeze dried shrimp/mysis, Formula flake, spectrum pellets and the weekly frozen mysis.
I do weekly 30 gal water changes religiously.
I hate seeing these high "nutrient numbers" and was considering pellets. I hear a lot of "if it ain't broke don't fix it" from people. I am kinda on the fence about doing anything different. Just want to hear somebody elses "numbers" where their tank looks good as well.
Thanks.
Herb