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Old 02-25-2011, 10:48 PM   #11
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how do you know xenia is more efficient than macro algae? just because it grows quickly?
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Old 02-25-2011, 11:05 PM   #12
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My Xenia grew very well and my macroalgae stopped growing. There was so little nitrate and phosphate that it couldn't grow. The Xenia kept growing very well though, and if it is growing it is using nutrients. It definitely won't hurt to use it as nutrient export (which I have seen listed multiple times in books and online).
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Old 02-25-2011, 11:09 PM   #13
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but they are photosynthetic. i'm not saying they aren't nutrient users, but i believe they can get nutrition from light. they don't necessarily need nitrates and/or phosphates.
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Old 02-25-2011, 11:41 PM   #14
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Yes they do. Light is a source of energy, not nutrients. Light doesn't give them carbon, nitrogen, phosphorus, or any other nutrient, they still need every nutrient from the water or food (Xenia use effectively only water, they are not big on actively eating). Obviously putting Xenia in the sump requires lighting, just like macroalgae.

The light provides energy for the zooxanthellae algae to make food using the nutrients from the water (photosynthesis). The Xenia gets most of its nutrition from the excessive amount of food produced by the zooxanthellae (which use very little of what they make).
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Old 02-26-2011, 12:06 AM   #15
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i was under the impression they could create their own food using photosynthesis. sort of like the plant in the cup of water on the window sill, that keeps growing, even though there is no dirt. it grows from the tiny amount of nutrients in tap water?

i'm still not convinced that xenia is more effective at nutrient export than the macro algae because they are 2 different structures. they grow at different rates, and one needs X amount of nutrients and the other Y amount.
the only way to know for sure is to take 2 specimens of the same size and put them in same size tanks, add the same amount of nutrients, then test after adequate time has passed....
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Old 02-26-2011, 12:10 AM   #16
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My tank has very low nutrients (no nitrate or phosphate on tests) so I think has a lot to do with. I also mentioned I have both, not Xenia instead of macroalgae, so you get the best of both. I think systems with higher nutrient loads would be better off with all macroalgae.

What plant are you growing with no dirt?

The zooxanthellae still need to get nutrients from the coral (either from the coral's metabolic waste or from the water through the coral). Photosynthesis is just the conversion of certian nutrients into others, not the creation of nutrients. The light simply powers the reaction.
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Old 02-26-2011, 12:13 AM   #17
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lol..i don't know the name of it, but it was a small branch that broke off of a larger house plant. it has been in a cup of water for like 6 months and has grown roots and considerable height with only water (i guess she's too lazy to replant it).
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Old 02-26-2011, 07:31 AM   #18
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Probably Pothos/Devil's Ivy.
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Old 02-26-2011, 09:48 AM   #19
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she told me it's a jade plant.
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Old 02-26-2011, 03:12 PM   #20
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Guess I'm just too cautious about xenia's ability to crash a system.
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