So i got about a 3" senegal bichir yesterday , and only have two tanks currently, and a fishbowl to grow out guppy fry, any way i have about 8 guppies and a pleco in a 15 gallon with a bunch of rock caves and such . and then a 40 gallon with a oscar a convict a dempsey and two gouramis. If i make a few more caves and such in my 40 gallon after my bichir outgrows the twenty with the guppies and the pleco could the bichir live with the dempsey and the convict? and how long before i would need my 135 gallon . I plan on gettin rid of the oscar i dont really like him much hes a hog .