I've got 8 fish in my aquarium, 3 guppys, 4 tetras and a beast of a loach, he's about 10cm long and we've had for about 18 months, but over the last month or so his behaviour has become eratic, he digs in the gravel and jumps out of the water sometimes as well. I'm wondering if he's maybe getting too big for my tank, its not a small, tank but i'm not sure how many gallons it is. If anyones got any advice or any ideas on what's up with him let me know please. I've become quite attached to the big fellow and i'd hate to think that he's suffering.