Keeping fish in a tank temporarily

[eatbreakfast]

There is no ammonia in the tank that it will eventually be placed in, but the nitrates are really high, what would you suggest doing

Nitrates are the end of the cycle. A largge water change will bring them down.

Holes should be drilled in the floating container so that his waste will not convert to ammonia and so that oxygenated water can get in.