Water quality levels

This section is dedicated to keeping Jellyfish in an aquarium. Dr. T is a specialist in marine plankton and he will be happy to help with any of your jellyfish questions.

Water quality levels

Postby jonathanyhsu » 26 May 2012, 16:20

Hi Dr. T,

Is there any specific information on the effects of ammonia/nitrite/nitrate on the moon jellyfish, such as specific symptoms? I could not find any studies that give approximate guidelines for when symptoms appear or how long they take to appear. I have been told from several sources to ideally keep the ammonia/nitrite at 0 and the nitrates below 10 or 20 ppm, but I can't find anything definitive on what happens if you go above that. Thanks!

-Jonathan
jonathanyhsu
 
Posts: 3
Joined: 26 May 2012, 16:11

Re: Water quality levels

Postby Cubic » 28 May 2012, 08:29

jonathanyhsu wrote:Hi Dr. T,

Is there any specific information on the effects of ammonia/nitrite/nitrate on the moon jellyfish, such as specific symptoms? I could not find any studies that give approximate guidelines for when symptoms appear or how long they take to appear. I have been told from several sources to ideally keep the ammonia/nitrite at 0 and the nitrates below 10 or 20 ppm, but I can't find anything definitive on what happens if you go above that. Thanks!

-Jonathan


Good question Jonathan, this is something our team debates quite regularly. I will let Dr. T answer your question first, before I comment, as he has more of an in depth knowledge on this subject than myself.
“Have nothing in your homes that you do not know to be useful or believe to be beautiful.”

William Morris.
User avatar
Cubic
Site Admin
 
Posts: 162
Joined: 02 Nov 2011, 17:22

Re: Water quality levels

Postby Dr. T » 29 May 2012, 13:01

Hi Jonathan,

Thanks for your post. This is very important question, everyone is wondering but actually quite hard one to answer. As you said, there is no scientific research on the effect of water quality on the health of moon jellies as far as I know. All information you can find is based on someone's own experience.

Most public aquariums seem to be trying to keep the nitrate level of jellyfish tank bellow 10 ppm. In aquarium with a closed system, those values could be higher (15-20 ppm). In this range, moon jellies still look fine but you start to see the decline in their growth and/or stopped feeding.

In Tokyo bay, where moon jellies occur in summer, the nitrate level in coastal area is usually around 4-12 ppm, and could go up to 30 ppm when it's really dirty. Guessing from those data, I would suggest that the nitrate level of jellyfish tank is preferably bellow 10 ppm, start to worry when it gets more than 10 ppm, and not more than 20 ppm, which is just same as you suggested.

It is really hard to link each symptom to water parameters. However, you might doubt of a big change of water quality (i.e. ammonia spike, big pH swing etc.) when you see sudden symptoms of disease in jellyfish such as losing oral arms, holes on the bells and collapsing (melting) bell. The effect of higher nitrate is slower. The first thing you would see is stopped feeding, which occur together with shortened feeding tentacles and less/weak pulsing. This symptom leads jellyfish to flattened bell and shrinking of bell size. These early stage of jellyfish symptoms could end up with any of the diseases we are discussing in the jellyfish health and disease section in our forum.

I will keep researching on this topic and will update when I have more information.
Image
User avatar
Dr. T
 
Posts: 26
Joined: 31 Mar 2012, 06:39

Re: Water quality levels

Postby Cubic » 31 May 2012, 11:45

One other thing I would add is that although nutrients like nitrate (N03) and phosphate (P04) may not be that dangerous to jellyfish, they still fuel the growth of unsightly algae so its worth keeping them as as low a level as possible.
“Have nothing in your homes that you do not know to be useful or believe to be beautiful.”

William Morris.
User avatar
Cubic
Site Admin
 
Posts: 162
Joined: 02 Nov 2011, 17:22

Re: Water quality levels

Postby jonathanyhsu » 31 May 2012, 20:39

Thanks for the information; I would be interested in any further results you discover. I have two moon jellyfish in a tank and while one appears to be quite healthy, the other arrived showing the symptoms you described. The bag of water they came in tested at 80 ppm nitrate, and I had been keeping my tank at the 10-20 ppm nitrate level. After 3 weeks, one of them began to show signs of eversion in addition to everything it originally displayed (reduced swimming, shorter feeding tentacles, reduced feeding ability). I'm keeping the nitrate levels at below 10 ppm now to see if it gets better in the next few weeks.
jonathanyhsu
 
Posts: 3
Joined: 26 May 2012, 16:11

Re: Water quality levels

Postby Cubic » 31 May 2012, 21:55

Good luck with that Jonathan, let us know if there is anything else we can help you with.
“Have nothing in your homes that you do not know to be useful or believe to be beautiful.”

William Morris.
User avatar
Cubic
Site Admin
 
Posts: 162
Joined: 02 Nov 2011, 17:22

Re: Water quality levels

Postby Dr. T » 24 Dec 2012, 19:43

The optimal water quality for Moon Jellies.
pH 8.0-8.4
NH3 = 0.00
NO2 < 0.03ppm
NO3 < 10.0ppm

The parameters above can be achieved by conducting 10-20% (depending on stock level, feeding amount etc.) water change every 2 weeks once the tank is matured. It must be reminded though, with most of jellyfish aquarium, the pH tend to lower very easily. The jellyfish tank is designed to avoid air bubbles going into the water to avoid damaging jellyfish. This means there are minimum gas exchange between the ambient air and the water in the tank. This causes the accumulation of CO2 in the water which drops pH. When you see pH dropping in the tank, please put aeration somewhere in the tank which is safe to jellyfish (back of the tank etc.). This will enhance the gas exchange, and stabilize the pH in the optimal range.
Image
User avatar
Dr. T
 
Posts: 26
Joined: 31 Mar 2012, 06:39

Re: Water quality levels

Postby Hull stingray » 02 Nov 2014, 09:24

What about the other elements like mag kh and calcium or don't they get used up because there is nothing else in the tank
Hull stingray
 
Posts: 6
Joined: 19 Jul 2014, 19:17

Re: Water quality levels

Postby Cubic » 03 Nov 2014, 09:47

Mag/KH/Calcium are used in reef tanks by Scleractinia (Corals with a hard skeleton) who incorporate it into their skeleton. Jellyfish do not have any skeleton so they do not use these elements to grow which means they do not deplete these elements from the water.

It may be worth while keeping an eye on KH because a low KH will have an effect on the pH of the water.
“Have nothing in your homes that you do not know to be useful or believe to be beautiful.”

William Morris.
User avatar
Cubic
Site Admin
 
Posts: 162
Joined: 02 Nov 2011, 17:22

Re: Water quality levels

Postby Hull stingray » 03 Nov 2014, 18:06

So do we chose a salt with a high kh to help maintain ph ?
Hull stingray
 
Posts: 6
Joined: 19 Jul 2014, 19:17

Next

Return to Jellyfish Help & Advice (Biology)

Who is online

Users browsing this forum: No registered users and 1 guest

cron