Whats wrong with my plecos?

[Jezzuur]

Hi guys. So I've had a 70l tank setup for around a year now and I've had my Bristle nose plecos for around 3 months. In the last few days when he's been on the glass I've noticed his mouth is a different shapes like he's sacking extra hard and also has red marks almost like a rash on his underside. He's eating fine and spends most of his time under the wood in the tank but does come out and have a swim around. Does anyone know what's the problem?

Tank mates, 6 neon tetra, 6 guppys, 4 assassin snails
Tank also has live plants. The ph and temp is also fine

[TropicalFishForums]

[Gingerlove05]

What sort of substrate do you have? I know some gravels and some sharp sands can cause damage to corys barbels and i imagine other bottom dwellers


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[Jezzuur]

Thanks for the reply. I thought that. I have sand in there at the moment. Maybe it would be worth switching it out

[Jamesfacchini]

What is the ph? Because you've got neons which like acidic water and guppys which like alkaline.

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[plankton]

Looks a bit ammonia burn(ish) to me, what are the water parameters (all of them including temp, ph and hardness please)?
Also what's the diet?

[Jezzuur]

Thasks for the replys. PH 8 and diet consist of mainly algae wafers with cucumber normally as a treat but it will also eat any sinking flakes

[Jamesfacchini]

Well thats alkaline which i dont think plecos are fond of. Im assuming you have quite hard water as well then.

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[plankton]

I'd try something veggie with a bit more fibre, like courgette or red/yellow pepper.
The sand isn't coral sand is it?

[Jezzuur]

The Sands not coral sand it's just basic plain white sand from pets at home. I've done a few water changes and will try some different veggies.  He seems fine so far however he's not been on the glass yet