Comments on: What Causes Coral Bleaching?

By: John

John — Fri, 05 Mar 2010 18:27:27 +0000

Hello.

If all your seawater parameters are up to standard then there are two areas that come to mind.

The first is seawater movement, is it adequate? Generally, hard corals require more movement than soft types. Have a look in ‘Articles’ on this website for more information on the subject.

Second and perhaps more likely is lighting. Generally hard corals require stronger lighting than soft corals. The depth of the aquarium also comes into the equation. Some aquarists use metal halide, others use fluorescent tubes, and some use LED arrays. Even if the lighting is of the correct power and spectrum, bulbs need to be changed on a regular basis as they lose efficiency over a fairly short period (this does not apply as much to LED systems). Again, perhaps a look in ‘Articles’ would be of use.

I hope everything comes right.

By: vikrant deval

vikrant deval — Wed, 03 Mar 2010 11:56:28 +0000

my all hard corals ar dying
every parameter in my tank is ok
can you help in to

By: Coarl Bleaching _7th | Burley's Science Blog

Coarl Bleaching _7th | Burley's Science Blog — Tue, 23 Feb 2010 19:24:33 +0000

[...] http://www.aquaristsonline.com/blog/general/what-causes-coral-bleaching/ [...]

By: John

John — Tue, 22 Apr 2008 18:11:05 +0000

Hello Heath.
Anemones are not the easiest to keep in an aquarium unlike what some think. Once settled they are long lived and entertaining, particularly with a clownfish (if it is of that type).
Generally, anemones have symbiotic algae in their flesh. This means they nust have the proper lighting, the same as is used for corals. It sounds as though the algae is being lost. I suggest you check the lighting. They also need high water quality and good water movement, again like corals. I don’t really understand why it is going ‘hard’.
It just so happens that an article on anemones called “Clownfish Anemones” has been put on the Blog. It went on on 21 April. A read may be of help.
Why not visit the Forum, where questions on all sorts of topics can be placed and answered. The forum is in the social area:
http://www.aquaristsonline.com/social

By: Heath

Heath — Mon, 21 Apr 2008 19:09:14 +0000

This is a question regarding an anemone. Mine has turned hard and is white on the sides. It still has its color on the top. I wasn’t certian it was dead so I contacted an aquarium store and they seemed to think it was a bleaching problem. Could this be? Should I seperate it from the tank?

By: John

John — Thu, 10 Apr 2008 18:46:33 +0000

Hi Rob.
Difficult to know why, generally.
Actinic lights don’t cause corals to collapse. They are targetted at the symbiotic alge within corals, as science tells us that this light spectrum is what is required. They do make the aquarium attractive though don’t they!
You should not be using actinic lighting on its own. The normal practice is to mix actinic with marine daylight. If you are using tubes then it is normal to match one actinic for one daylight. Many metal halide users have actinic tubes in use. The use of reflectors is recommended.
I use tubes as described. The actinics come on first but I have noticed that the corals seem to react (expand) to the marine whites the most.
Remember also to check your seawater quality – is it up to the mark?

By: Rob A. Krausse

Rob A. Krausse — Wed, 09 Apr 2008 01:00:06 +0000

this is more of a question. For about 3 days my green starburst polyp was doing good. Then for some reason it flopped over and now the tips are turning white; what could be the problem? Are anitic lights to strong; should i be using a daylight bulb? Help!