as some of you may know, ive been struggling to think of ideas for my 29 gallon tank. all it has in it are 4 melanistius cories and 6 otos now. i was wondering if i could have maybe 2 firemouths in it. would they kill the otos/cories? if the cories and otos would be a problem, i could get rid of them. how big do firemouths get? about 5"-6"? thanks in advance for any info *crazysmil