i am going to have a new 180 gal tank and planning to put 1 aro, 6 datnoids, 5 clown loaches. would it be better to have gravel or bare bottom? not based on looks but based on stability of the tank in terms of nitrate, nitrite and amonia levels. it will have a 300 gal capacity wet/dry filter with 5x turn around on water per hour. 
