i have a 35 gallon hex tank. i plan on putting in some angelfish, bristlenose pleco, redtail shark, and maybe some tetras of some sort. not sure yet however. is there any type of invertebrate that you could reccommend for my tank to add some uniqueness to it. also what invertebrates would do a good job in cleaning my tank and go with my planned fish? (i know i still need a good filtration system, i have an aquaclear filter) Thanks for the time and consideration!