BloodredOscar;2662455; said:
Do you have a gravel cleaner/hose? Water changes, i'd go for twice a month.
with a 12" blue channel and 2 oscars, you tell him to do 2 wc a month??? with that bio-load in a 55g, he should be doing 2x WEEKLY
you honestly need to think about upgrading your tank. if thats not possible, you most definatly will need to get rid of your oscars. properly fed, and cared for, an oscar should reach MINIMUM 10", possibly 12 or 13". theres no way a fish that size should be kept in a 55g tank which is only 12" wide, leaving the oscar no room to turn.
theres alot of other interesting fish that would fit for life in a 55g. as suggested, a jack dempsey fits the bill well. they get to a good size, but just small enough to live out a decent life in a 55g. plenty colorful as well.