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JiaEn last won the day on February 27

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  1. To (not) Imitate the Sun Let's start by putting away the delusion that aquarium lighting is meant to imitate the sun. Sunlight striking the surface of the sea is intense, continous and almost unidirectional. Firstly, the intensity of the solar radiation is very high. The average solar irradiation on earth surface is 1380 W/m^2. This means for a 3ft tank, it needs to recieve 566 W of irradiation. If we assume the LED lights are the most efficient ones, (50% efficiency), we need 1332 W worth of light set to power the 3ft tank. Crazy, right? Secondly, the solae irrad
  2. JiaEn


    Indeed fleece style filtration is not condusive for planktons. But perhaps good generation and less aggressive mechanical filtration may spare enough?
  3. Yeah. Bracing take away quite a lot of light. It's interesting to shape the growth pattern by adjusting topological light profile
  4. Do I see a hot spot of light where the Bali slimer grows sideways rather than up? Right hand side half way up.
  5. Fluctuations One of the tenet of reefing is that the parameters need to be stable. How much fluctuation is acceptable? Is it the best for my reef if parameters don't fluctuate at all? With the advent of modern reef computer and monitors, more and more reefers see their tank parameters in ever finer resolutions. Inevitably, with the ability to measure, comes the desire to control. Do we need to care if the pH fluctuates by 0.5? Or should we be concerned when kh raises by 1dkh? Is there any benefit to keep the temperature within a 0.5℃ window? Just like everything in reefing
  6. JiaEn


    I have been thinking about the feeding habit of these NPS. They have colonial polyps which require individual feeding. I am quite doubtful that they can all have a good share of bigger pieces of food in the wild. The density of larger sized planktons is just not that high. Thus I suspect they actually prey on smaller nanoplanktons I did some quick search on papers regarding the gut content of Tubastrea sp. , it seems that 70%+ of the content is in fact nanoflagellates. If so, would an aquarium with robust nanoplakton population be able to sustain these animals without addition
  7. Thank you for your encouragement
  8. Florescent Proteins While zoox supports life functions of coral, and gives it the much dispised brown color, the florescent proteins (FP) are the reason why we try so hard to keep corals in our aquarium. FP are complex molecules which require a lot of resources to produce. If coral pays hefty price for these proteins, they don't do it just to please our eyes. In fact, FP are essential for coral to survive. FP and Zoox One important reason for the existance of FP is that zoox are very selective when it comes to the type of light it can use. As it turns ou
  9. Accidentally clicked post before completing ...Without the zoox to absorb the light, the coral produce florescent proteins to absorb powerful solar radiation, and reduce light stress. This is the reason why corals have fancy colored growth tips. The same thing happens when coral bleaches, as the coral tissues loses zoox, they become vulnerable to photo damage. If the coral have sufficient reserves, they produce florescent proteins to mitigate the damage. That's why bleached corals can look surreal for a while, just before they succumb. Excessive zoox, on the other hand, pr
  10. Zooxanthellae When it comes to coral color, aquarists often focus on two factors: zooxanthellae and florescent proteins. The zooxanthellae (zoox) which is a symbiotic organism living within the corals (zoo-: animal, xanthe: yellow). Like the name suggest, zoox are yellow in color. They live within the tissue of coral, grow and multiple based on the availble inorganic nutrients. Coral derives nutrients from zoox, and in turn provide refuge and inorganic nutrients to support their photosynthesis. Since zoox is yellow, its concentration will directly contribute to the golden/yellow c
  11. Coral Fluorescence Coral fluorescence is one of the topic which puzzles me greatly. The florescent proteins and zooxanthellae density are all well studied. But what we do in the hobby, or rather, what works in our hobby, is not well explained by the science behind coral fluorescence. I will attempt to compare the science with practice, then perhaps we can see if there is any missing pieces of the puzzle. Coral Fluorescence in Hobby When it comes to reef keeping hobby, the ways to achieve good fluorescence for corals, especially SPS corals, are well established. We
  12. It's meant to hang outside the tank. But yeah. It's not cheap, but it's very efficient.
  13. Deltec MCE 300 is extremely effective, but a bit ugly
  14. So far it works for me. I would say the nutrient level in the aquarium is good and sustainable. A bag of zeolite will not work nearly as well, because it's the periodic shaking and tumbling which cause the bacteria flocks to be released into the water . It will. but of course, there is a limit as to how much imbalance it can correct. One good thing about ats is that, you don't have to pick out the "correct" algae. The natural competition will take care of it for you.
  15. On the issue of competition. What I feel is that microalgae is extremely effective at using up nutrients in the water. Not just the trace elements. Nitrates and phosphates will also be consumed rapidly. They will also take up some organic compounds form the water coloumn. All these are fine, but when they do it too well, there will be less nutrient available for the corals. For me, I'm of the opinion that it's not ideal to feed corals (a lot), only for the food to be taken and grown into microalgae. This is what I mean when I say there is quite a lot of waste. ATS, jus
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