i think i'm the proud owner of a used acrylic 240g w/no overflows or drilled holes, 3 eheim 2128s and an emperor 400. i have a 3-5" midas, jaguar, 2 carpintis, 1 jd and 1 convict. assuming i put a few more fish in this aquarium, is that sufficient filtration or should i be looking at more and/or different?