very best wishes
In the open waters of the wild, they've been known to get up to 20-inches long, but there they have all the space in the world to grow.
A 25 gallon aquarium is 'about' 24x12x20. A Dojo loach has a average length of 9" to 10".
A average room in a lot of homes is 12'x8'x10'. In the US, men (on agerage) are 5' 10" in height.
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In the wild fish that are temporarily in a smaller puddle produce hormones that make them not grow temporarily.
When the rains come, these growth hormones in the water are diluted and the fish start growing again.
If you do enough water changes to keep the hormones properly diluted then the fish will grow to their proper size in spite of the small tank. Then there is not enough room for them to move around properly.
Other good bottom species for cool water, small tanks:
Certain species of Corydoras (Planet Catfish is a good resource for catfish information). Many of them handle temps as cool as the high 60sF and almost all are fine in the low 70sF.
Certain Gobies and some Tetras that behave like Gobies. You might see them listed as 'Humming Bird Tetras'. They are solitary, and perch on the bottom the same way Gobies do.
Happy fish keeping!
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