Leopard danio lethargic and arched back


Active Member
One of my leopard danios, its the smallest one. Its always been tiny. I noticed it just hovering yesterday. Not fighting for food. It keeps sitting on the sand and on driftwood or ornaments. Its back is arched. I thought it was dead this morning but its eyes moved. I went to take a picture and it righted itself and swam off. Any help would be much appreciated. We have also experienced a mini heatwave lately so the tank temp has been between 27C and 28C. Around 80F! I've not had the light on. Opened the lid a little and put the filter right to the top for maximum aeration. My temp is usually 24C/75F


What is the water volume of the tank? 125L/33US Gallon
How long has the tank been running? A year
Does it have a filter? U3 and small 300 litres an hour with crushed coral to buffer ph
Does it have a heater? Yes
What is the water temperature? Usually 24C. Been 27C due to heatwave
What is the entire stocking of this tank? (Please list all fish and inverts.) 4 zebra nerite snails, 1 adult rabbit snail and 3 babies, 3 zebra danios, 3 leopard danios (one being the ill one), 5 glowlight danios and 6 peppered coreys

How often do you change the water? Twice a week
How much of the water do you change? 20% twice a week
What do you use to treat your water? Api stress coat
Do you vacuum the substrate or just the water? Both

*Parameters - Very Important
Did you cycle your tank before adding fish? No
What do you use to test the water? Api master test kit
What are your parameters? We need to know the exact numbers, not just “fine” or “safe”.

Ammonia: 0
Nitrite: 0
Nitrate: Below 5
pH: 7.2

How often do you feed your fish? Once a day
How much do you feed your fish? Flakes or micro pellets for fish, pellets or algae wafers for coreys, calcium blocks and veg for snails
What brand of food do you feed your fish? Hikari
Do you feed frozen or freeze-dried foods? Frozen bloodworm once a week

Illness & Symptoms
How long have you had this fish? 10 months
How long ago did you first notice these symptoms? Last night
In a few words, can you explain the symptoms? Explained above
Have you started any treatment for the illness? No
Was your fish physically ill or injured upon purchase? No. But was always small/ a runt maybe?
How has its behavior and appearance changed, if at all? Explained above

Explain your emergency situation in detail. (Please give a clear explanation of what is going on, include details from the beginning of the illness leading up to now) Explained above

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