From a previous post of mine …….
Years ago I kept a group of approx. 15 clown loaches by themselves in a 6ft 125 gallon species only tank. When the tank lights went off each loach would within minutes gravitate to their special resting spot in the tank. They appeared to sleep in the exact same spot each night, and I had several with unique markings so it was easy to establish who rested where. Some laid on the sand, some in caves, some in special nooks of the driftwood, some laid on open stretches of a certain section of a specific piece of driftwood. I had never seen this behaviour over the years when keeping them in community set ups.
It's hard to explain, but IME the loaches acted differently when on their own, spent little time in hiding, and took on an overall completely different vibe.
Years ago I kept a group of approx. 15 clown loaches by themselves in a 6ft 125 gallon species only tank. When the tank lights went off each loach would within minutes gravitate to their special resting spot in the tank. They appeared to sleep in the exact same spot each night, and I had several with unique markings so it was easy to establish who rested where. Some laid on the sand, some in caves, some in special nooks of the driftwood, some laid on open stretches of a certain section of a specific piece of driftwood. I had never seen this behaviour over the years when keeping them in community set ups.
It's hard to explain, but IME the loaches acted differently when on their own, spent little time in hiding, and took on an overall completely different vibe.