If you took something out, then you lowered the amount of nitrifying bacteria in your tank, so it's trying to catch up. It'll lower itself back down, don't worry about it too much. Just monitor the levels.
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29 gallon - still sitting in the car
20 gallon - growing HC, starting to cycle soon
15 gallon - Betta (f), Dwarf Gourami (f), 10 Neon Tetra, Mystery Snail, Ramshorn Snail
10 gallon - 2 Peppered Cory, 3 Pygmy Cory, Ghost & Cherry Shrimp
05 gallon - growing out some java moss, and future home of female betta in 15 gallon (she's getting bullied by DG)
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