Reasons they get more territorial:
They were immature when you bought them, now they are maturing.
You added female Gobies.
Something else changed (temperature, water parameters...) that triggered breeding hormones. Now the Gobies want to claim some space.
Ways to stop it:
Have enough space for the fish. (or fewer fish per tank).
Break up the space with natural barriers so that each fish can claim a space, and know where the barrier it (rocks, driftwood, plants).
Remove the most aggressive one. Set him up in his own tank with no other bottom fish, but a school of upper level fish might be OK.
Happy fish keeping!
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