What are your levels of
ammonia,
nitrIte, and
Nitrate?
pH
TDS
GH/
KH?
Temperature of the water?
Water change schedule,
size tank,
how much water changed and
how often???
I would get a couple of
pwc's done asap - one today and one tomorrow. Any time there is a possible issue that is a good first step. If you have any unsafe levels in the tank, do another
pwc right away to get the water safe.
Bulging eye usually indicates poor water conditions, or infection.
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New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?

Start here - Aquarium Advice Article
https://www.aquariumadvice.com/guide...ater-aquarium/
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves