Help! Identifying a big issue in aquarium

[DylanTropical]

Hi,

I am been running a Fluval 307 canister filter in my 240 planted Aquarium, I fed my tiger barbs some live blood worms, woke up the next day and 80% of my fish were dead, it looked like most the fish that ate the blood worms didn’t survive, I performed a 50% water change, (the day after all the remaining fish were swimming and eating fine), I left my tank running with low stock for about a week, tested my water parameters all was ok, so I decided to re stock my tank, I went with some lemon tetras, added them yesterday, again tested the water to make sure everything was ok, it was. Today I woke up to discover 2 of them died, does anyone have any suggestions on what this could be or if it is just a bad batch of lemon tetras?

 

[UnknownFishies]

First. Never add fish to a tank that recently had a dead fish. Always wait about a month. Also for your original problem, check your food for an expiration date maybe? That might be the cause of this.

 

[Colin_T]

Any chance of pictures and video of the fish?

How long has the tank been set up for?
How long have you had the fish for?
What other symptoms are the fish showing?

How often do you do water changes and how much do you change?
Do you gravel clean the substrate when you do a water change?
Do you dechlorinate the new water before adding it to the tank?

What sort of filter do you have?
How often and how do you clean the filter?
What is the ammonia, nitrite, nitrate and pH (in numbers)?

Have you added anything new to the tank in the 2 weeks before this started?

 

[OliveFish05]

Sometimes live foods can carry disease I believe...? Maybe that is what happened

 

[DylanTropical]

First. Never add fish to a tank that recently had a dead fish. Always wait about a month. Also for your original problem, check your food for an expiration date maybe? That might be the cause of this.

I brought the live food from a garden centre so it didn’t have an expire date on, so from the result of dead fish I’m going with the food was out of date

 

[DylanTropical]

Any chance of pictures and video of the fish?

How long has the tank been set up for?
How long have you had the fish for?
What other symptoms are the fish showing?

How often do you do water changes and how much do you change?
Do you gravel clean the substrate when you do a water change?
Do you dechlorinate the new water before adding it to the tank?

What sort of filter do you have?
How often and how do you clean the filter?
What is the ammonia, nitrite, nitrate and pH (in numbers)?

Have you added anything new to the tank in the 2 weeks before this started?

Fluval 307, canister filter,
40/50% water change weekly,
Clean the substrate weekly,
Tanks been running for 12 months ish,
Had the same fish in since the start, (12 tiger barbs)
I use API tap water conditioner with API stress coat,
I fed them the live food in the evening, swimming as normal, ate the food as normal, next morning they were dead,
Ammonia 0ppm
Nitrite 0ppm
Nitrate 20ppm
PH 6.8

 

[P J]

Hi Dylan,Most likely a bacterial disease introduced with the live blood worm, perhaps columnaris it can kill fish overnight.
So sorry for your loss obviously don’t buy from that supplier, frozen blood worm is a better option I think. PJ

 

[DylanTropical]

Hi Dylan,Most likely a bacterial disease introduced with the live blood worm, perhaps columnaris it can kill fish overnight.
So sorry for your loss obviously don’t buy from that supplier, frozen blood worm is a better option I think. PJ

That’s it mate, I 99/100 I use frozen then this happened. 100% won’t be going back to them

 

[Colin_T]

Live blood worms (Chironomid midge larvae) or live black worms (an aquatic worm like Tubifex?

Pictures of the remaining fish so we can check them for diseases?