As an adult blood worms won't cut it though would they? He's going to need something larger. Possibly frozen shrimp or prawn?
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A cube to itself will be fine. Just dont let their begging for more fool you. I do pellets for breakfast, frozen for dinner, no lunch, and fast on fridays, water changes, and tank maintenance on saturdays or sundays.
The guy above is right about long term, the 55 wont cut it but you should be ok for a year, but then again that can vary too fish by fish. They are fast growers, but not all, and most will slow down after the 6" mark. It'll be a couple years before it reaches 12" IMO if it reaches 12" .
Oscars are also very susceptible to HITH, with that said to lower the chances on it to possibly happen i wouldnt run carbon. Just focus on biological, and mechanical filtration aspects. Oscars could also care less about plants, prob rip them up if anything. If iw ere to go with plants i'd go with hardy plants you can suction cup to the glass or tie down good, but then that may not even work.
Map turtles vary in size based on sex. Its the females that get big up to 11', i think males max around 6-7". They like to bask, so you'd have to setup the 55 right for a upper level for it to go to, it's not going to want to stay submerged 24/7
Hikari bloodworms have added vitamins, they are plentiful for nutritional value o.O here's my "reality check" lol
Ingredients: Blood worms, water, beta carotene, vitamin B12 supplement, pyridoxine hydrochloride (source of vitamin B6), l-ascorbyl-2-polyphosphate (stabilized vitamin C), riboflavin, thiamine mono-nitrate, biotin, choline chloride, folic acid, pantothenic acid, inositol, niacin.
Same goes for their shrimp :-/ It's healthy to feed your fish a mixed diet, then giving it pellets that mainly focus on color enhancement. Which also i do believe has less protein then a cube of bloodworms.
Hikari spria brine is packed with vitamin C as well. Anything hikari is of decent value really