I have a 29g tank with 5 wcmm. The outside air fluctuates from about 67-73 degrees, but occasionally it can get as low as 65 and as high as 75. Are there any corys that would work well in this tank? Also I have ecocomplete substrate and am on planning on topping it with Caleb sea super natural sand. I am also planning on getting about 3-6 more wcmm.