Guppy health question

Kamdavid said:

You’re sure it’s a male , right ? Do you have pictures ?

corylover5 said:

What size tank is it?
What are your water parameters?
What other fish do you have and how many?
How long has the tank been set up?

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Thanks for the replies. Sadly, shortly after writing this the worst happened. He was lifeless behind the filter.

It's a 64l tank. The Lovefish one. I have (had) 4 male guppies, 15 tetra and 4 cory catfish. I only cleaned it last week and home tested it about a month ago. I've had it about 3 months. Like I mentioned, 2 of the Guppy's behaviour changed over the last few days. The other one seems fine now, but you can tell they're missing their mate. The 4 Guppy's used to swim around 'as one'.

Any ideas what could have caused it?

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Colin_T said:

It's either poor water quality or a disease. However, we need a close up picture of the fish to check them for diseases.

Wipe the inside of the glass down with a clean fish sponge.

Do a 75% water change and gravel clean the substrate every day for a week.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

Clean the filter if it hasn't been done in the last 2 weeks. Wash filter media/ materials in a bucket of tank water and re-use the media. Tip the dirty water on the garden/ lawn.

You can add 2 heaped tablespoons of rock salt, sea salt, or swimming pool salt for every 20 litres (5 gallons) of tank water. Keep the salt in the tank for 2 weeks.
When you do the daily water changes, add salt to the new water before adding it to the tank so the salinity (salt level) in the tank remains stable.

Monitor the remaining fish and post pictures and video of them if they act unusual.

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