Do You Think It Is Possible To Have More Then One Sun In A 75 Gallong Reeef Tank With Out Polluting It To Bad
Take a look at Daniela Stettler tank:
pdf presentation,
interview,
more (all are in German, translation can be made by Google language tools, and
in French.
Italian reefing website acquaportal.it has photos of many tanks, mostly Mediterranean fauna, with multiple sun corals.
As I understand, the key is to have an oversized very efficient skimmer and feed by washed whole food, like mysis, artemia (brine shrimp), Pacific or Ocean Plankton. You can compare by yourself effect of homemade grocery seafood and mysis on developing undesired growth in the tank (not so NO3 or PO4, but microalgae, hair algae, red cyano, bacterial growth, aiptasia and so on).
This is with insufficient skimmer and not optimal water flow, plus frequent feeding by grocery seafood, with other unresolved issues. 90g:
what other corals do you know of that don't require expensive lights?
Love the topic! Allow me to elaborate a little, from my experience, that started with the same question.
There are non-photosynthetic corals, that don't require light at all, but most of them should be fed a lot, that requires a very efficient significantly oversized skimmer (>$250), wavemaker or set of powerheads, doing the same - moving detritus to the filtration/skimming. Most are using automatic feeders (not the usual fish feeders, unless modified), probiotics, UV and, some, ozone. Economy on the electricity cost is overcame by cost of salt for water changes and its delivery, food and filtration. Compare pure cost of the difference between 150W to 250W, apart from necessity of cooling (chiller or AC), not the whole monthly electricity bill.
Very few (known to me) are using refugium type of the tank, without too much additional feeding. Very few non-photosynthetic corals live there (see the thread at Ultimate Reef Azoo forum about Chili coral keepers).
Another option is tank with low-light tolerant corals. Less water changes, less filtering, reasonable light, but no challenge.
I kept under 18W 50-50 combo PC (12" deep tank, 6g): white pom-pom xenia, green star polyps, neon-green candycane, hammers and frogspawn, hairy mushroom, white lemnalia. Slightly more was necessary for bright red mushrooms, blastomussa merletti, anthelia and purple lemnalia.
Less than 1W'gal (90g, 48" L x 24" D, 110W PC): all of the above from the middle to the top of the tank, gsp, that are losing color, and Kenya tree at the bottom.
Another option is deep water fish and fire shrimp tank, or tube anemones tank (this requires no light, but the moderate sized peachy one expanded same day to 11" in home tank. Nothing special in equipment or water changes.
here is example of tank with many tube anemones in it.
Or sps (or LPS) nano with 70W DIY MH or Viper MH.