i like how neat and tidy your viv layout is.nice job.
when you said you added amount of sub,what does that mean?
like Pluto said the sub doesnt look too deep.
if its less than 6'' id add more.
in my 10 gallon one side is 6'' and the other tops out at 10''.hahaha hey in the wild the substrate is perpetual.
how big is the viv?id add another hiding/burrowing spot,but then again i dont see room for that but no biggie.the water dish may probide a spot to dig under too.
a cotton wad is redundant,its gonna build up bacteria and if the water dish is shallow you dont need it.if the water dish isnt shallow add some gravel to make it shallow.
if you want to make adjustments id do em now and leave it alone.they dont like you messing up the security of familiarity in their domain and adds stress to their lil hearts.
what is this crack you speak of?
also what do you mean you keep its tank in your room at night?where is it during the day?