Fish Dieing For No Reason

[montymonster]

Hi I have a 45 litre tank which had 14 fish in it, 3 mollys, 5 neons, 1 angel and 5 guppys. The mollys and the neons had been in the tank quite a while, I added the angel and the guppies about 2-3 weeks ago. Within a week one of the guppys had dies which I thought was just through the stress of changing tanks and then one of the mollys also died. Since this weekend though I have lost 3 guppys, all 5 neons and another molly. There isn't any problem with the water, nitrate, nitrite and ammonia were all 0 and pH was 7.6. The water is changed every 3-4 weeks and the filter is replaced every 6. All of the fish are netted into the tank and all of the plants etc are washed in the water that has been removed from the tank. The only sign of illness was that one of the guppys has developed some whitespot, I was advised to increase the temperature from 24 to 30 gradually and the tank is currently at 27 to treat this before trying a chemical treatment. Any ideas what is going on?

 

[WILDER]

Your tanks severely overstocked. Angels eat neons in the wild so shouldn't keep them together.
Angel fish need no less than 25 gallons.
Tetra and livebearers need no less than 10 gallons as they are active fish.


Once tanks cycled you should be doing a water change and gravel vac one a week.
When you say filter is replaced every six weeks what do you mean. The sponges.

Whitespot looks like the fish has been sprinkled in salt.
Raise temp to 30.
Increase aeration as the high temp and med reduce 02 in the water.
Only half dose with having neons as they are very sensitive to whitespot meds.
Remove black carbon from filter if you use it.

I would take a sample of your water to the lfs and ask them to write the readings down for you.
I would strongly suggest investing in some liquid test kits of your own.

 

[montymonster]

Thanks. I have had the water tested by them the results were what I wrote, they wrote them down for me. There was only one fish with white spot and I was told to turn the temperature up first before adding chemical treatment because if you catch it early it can be rectified that way.

My tank doesn't have gravel it has ceramic media, which is also a biological filter, the manufacturers advised to only clean it out every three weeks and do partial water changes at that stage. There is a sponge filter as well which they recommend changing every 6 weeks, which is what I'm doing. As there isn't anything wrong with my water I presumed it was ok.

The fish aren't bullying each other or eating each other they are just dieing in quick succession. Since my post another one has died and I'm currently watching the other 2 die and there won't be any left then.

 

[WILDER]

Your tanks over stocked with the angel, so once the med finished I would think of rehoming him.