Sorry to interupt but...
Say a nice odd number such as 13 or 15.
Any reason why? or do you just like odd numbers
I have always been of the belief an odd number of something looks better than an even number. I don't know why, you can trace it back to simple principle, even aquatic principles. The shape that 3 naturally gives you is a triangle, 2 is just a line and 4 gives you a square. The triangle is always more dominating and vivid. We use these shapes in aquascapes, using jagged rocks, planting in 3's giving contrast instead of a mass of plants or a row of plants. The same works with fish in a tank, you get the basic shape. I'm not saying that if you have 8 fish they're going to swim in an octagonal shape, but the odd number creates 1 left over, makes it uneven or "odd". Such as in an iwagumi set-up you would have
3 poignant rock formations each in contrasting sizes. Or as a centre piece fish having
3 always looks better than 2 or 4. Do you not think. From experience i had 10 rummynose in my 3ft tank, they were just there...but when i lsot one i had 9 left and they looked more natural. I'm not mad, honest. I hope that makes sense, it certainly confused me typing it.
Also Craig, you won't find a Khuli loach in your tank
They hide ALOT. A friend of mine had some and he swore blind they all died, but a few motnhs later whilst doing a rescape low and behold they popped out of the substrate!
