02-23-2010, 07:21 AM
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I would change out five to ten gallons of water each weekend without fail using a dechlorinator for new water that I add before I add the new water to the aquarium. 30 gal? I would also try and vaccum the gravel (especially with Under gravel filter) once each week as well. I would get my test kit back from my uncle or buy me another one and i would test the water each week before a water change to see that ammonia and nitrites read zero,and NitrAtes are not much higher than 20 ppm. Temp 78 degrees F.
I would not feed the Oscar live feeder fish (as indicated under info on your aquariums)unless ,,I was raising the feeder fish myself. Store bought feeders can and do, frequently cause fish to become sick due to parasites and or disease they carry from crappy enviornments that these feeder's are kept in, and they provide very LITTLE nutrition for your fish.
I would feed the pleco alage wafers,cucumber slices,strips of lettuce with rock and rubberband to hold it down,along with maybe zucchinni,sweet potato,spinach leaves,and whatever foods are offered to the oscar. Is true,most plecos enjoy wood if not to rest on,next to,or under,it sometimes is helpful for their digestive functions depending on species.
Within another three or four months,the Oscar will outgrow the 30 gal? and will put a heavy load on filtration while making it difficult to maintain water quality and the Pleco is also going to create problems maintainig water quality due to large amounts of poop they can produce especially, common pleco.
Excess food,excess poop,plus large messy eater such as Oscar = frequent large water changes in smaller tanks. In my view,,75 gal would be minimum for one Oscar assuming you wish for the fish to remain healthy through adulthood.
Filter for a tank holding an Oscar should be capable of filtering six to eight times the volume of water the tank holds each hour. Example.. 75 gal x6 =450 gal per hour.
This is all my opinion and is what I would do were it me to try and care for the fish . Fish kept in properly maintained aquariums are much less likely to become sick .