So AQ advisor says 5 Frontosa (4 females to 1 male) is fine for a 120g (48”x24”x24”) for life. They would be the sole inhabitants of the tank other than some ghost shrimp. I always throw a pile of ghost shrimp in tanks with rock work to clean trapped food out of the tiny crevices. Just want to know if that would actually be an adequate housing for them, or if that would be too small. Would a 125g long tank be better?