Heat and starving fish - The Planted Tank Forum
 
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post #1 of 12 (permalink) Old 07-09-2012, 11:00 PM Thread Starter
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Heat and starving fish

Strange things have happened in my 30 Litres / 8 Gallon fish tank, resulting in the loss of 2 celestichtys margeritatus.

Problems started with the hot and dry weather, that has not changed since the beginning of June. Temperatures rose over 30 C /90 F. My fish tank was invaded by probably blue-green algae, that stopped, after i put a bag over the fish tank when I left 5 days ago. when I returend, I found, that two of my fish had notches, where their bellies had been. I fed them two or three times and installed my self-built coČ-set for 2 hours.

I bought some living daphia, when i set them into my fish tank, i saw all of my 6 fish swimming. One hour later, I found one of the nearly starved fish dead, although he had been eating. On fish is missing, I could not find him.

I am now looking for the causes of this sudden deaths. Is it possible, that my fish died after i fed them? Is it possible, that too much coČ got into the tank? Could the heat be a reason?
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post #2 of 12 (permalink) Old 07-09-2012, 11:51 PM
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Warm watet isn't as friendly to dissolved gasses. It is possible that you added too much gas to be dispelled, but you wouldve noticed them dashing to the surface trying to breathe. I gassed some cheery shrimp at one time... They pass out and float to the surface.. most of them woke up.. i only recall removing one dead female. Otocinclus were fine, but they have a labyrinth? Do you know your tanks stats, can you get them tested if you dont?
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post #3 of 12 (permalink) Old 07-09-2012, 11:58 PM
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It could be a combination of all of the above. Most fish are capable of going more than a few days without food (a lot of them peck on algae growing on your plants/rocks). The fish may have been really stressed from lack of food , heat and the addition of CO2/lower oxygen content was too much for them. Remember that warmer water can hold less concentrated oxygen that cold water. I did a search of your fish species, and wikipedia (http://en.wikipedia.org/wiki/Danio_margaritatus) said they prefer temperatures from 20-25 degrees C/high 60s to medium 70s degrees F.

Also smaller tanks are more susceptible to temperature swings due to their smaller size. I'm sorry for what happened to your fish.
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post #4 of 12 (permalink) Old 07-10-2012, 12:29 AM Thread Starter
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I used a test strip that afternoon, everything was fine with no measurable NoČ, very few Noł and the PH at ~ 7. As I changed a nearly half of the water before the fish died, so toxic substances in the water could not have been the cause.

I am thinking about a possible connection between the heat, the lack of food and the coČ, but I could not find anything about this. Without having too much knowledge on the vital functions of fishes, i got the idea, that the cause might affect the ability to breathe.
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post #5 of 12 (permalink) Old 07-10-2012, 01:06 AM
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One thing you should know is that test strips are said to be less accurate/reliable than liquid test kits. Good luck.
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post #6 of 12 (permalink) Old 07-10-2012, 01:23 AM
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I am having a little trouble with the sequence of events here. You have an 8 gallon aquarium. It had blue-green algae. You put a bag over it, and left it for 5 days. When you came home, the fish looked starved/sick. You fed them, turned on your co2, and had 1 dead, and 1 missing, an hour later. Is that right?

What kind of bag was covering the aquarium?
Was there any way for air to get into the aquarium?
Was the water 90 degrees?
Did you test for ammonia?
How many fish in the tank?
How long has the aquarium been set up?

Standard 10 Gallon (20 x12x12).
Low tech, Sand substrate.
Eheim 2211, and Aqueon Quietflow 10.
Finnex Stingray LED, 20" above substrate
2 Anubias Nana Petite, Christmas moss.
4 Halequin Rasborahs, 5 RCS.

Last edited by livingword26; 07-10-2012 at 01:42 AM. Reason: correction
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post #7 of 12 (permalink) Old 08-16-2012, 06:46 AM
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Galaxy Rasboras don't like temperatures over 30 c. They will die, I've lost too many..
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post #8 of 12 (permalink) Old 08-16-2012, 08:43 AM
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Did you really leave 5 days with no food for them?

Well, no point in dwelling on what's happened - instead try to prevent these types of possible stress. Heat? Starvation? Lack of oxygen? No good, no good, no good. If you can, put a fan on top of the tank and let it blow over the surface. It'll drastically reduce the water temp.

Keep up weekly or twice a week water changes (perhaps 25% only and not 50%) I'm sure you won't get more losses.
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post #9 of 12 (permalink) Old 08-16-2012, 11:01 AM
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fish don't get pinched stomachs and starve in 5 days. They got stressed, got sick and died. The DIY CO2 was the final nail in the coffin.
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post #10 of 12 (permalink) Old 08-16-2012, 01:18 PM
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Putting a bag over the tank would have also made the heat situation much worse by eliminating cooling from water evaporation (which is a significant source of cooling for tanks, even when they don't have fans on top).
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post #11 of 12 (permalink) Old 08-16-2012, 02:01 PM
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The base cause is something that we see in different forms far too frequently. When making a radical change in the tank, it pays to watch far more carefully than normal.

Covering the tank is a major change, leaving for five days is not good policy. Fish won't starve in five days but if algae dies and pollutes the water at the same time the temperature goes high, there can be a problem.

Adding CO2 when the fish are acting strange in any way is not a good idea.

Sorry, sounds like a set of actions which led to being too much for the fish to handle.
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post #12 of 12 (permalink) Old 08-16-2012, 03:32 PM
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Quote:
Originally Posted by PlantedRich View Post
The base cause is something that we see in different forms far too frequently. When making a radical change in the tank, it pays to watch far more carefully than normal.

Covering the tank is a major change, leaving for five days is not good policy. Fish won't starve in five days but if algae dies and pollutes the water at the same time the temperature goes high, there can be a problem.

Adding CO2 when the fish are acting strange in any way is not a good idea.

Sorry, sounds like a set of actions which led to being too much for the fish to handle.
^This!
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