George wrote:

If you've only had these fish a few months, it is possible that a pair bond
has just been established between the other two, and this one is simply no
longer wecome. Watch the behavior of the other two and report back on how
they are behaving towards one another and whether they are making any
changes in the immediate environment where they like to hang out (i.e., any
nesting behavior should be noted, such as digging in the bottom sand
beneath a rock). They are substrate spawners, so they will try to keep
their nesting area clean of debris and unwanted critters, and will defend
it.

George

I will definitely do that, thanks.

BrandonB