I bought some water lily bulbs from petco and the one I keep in my sorority has exploded with growth O.O It's gotten so big! All my fish seem to love it, and the Anubias(plant) especially loves being in it's shade.
They are technically called "tiger lotus" (Nymphaea lotus) They come in red or green varieties - looks like you have a red. I do as well.
They grow FAST and LARGE. I have mine in a 10 gallon community tank, so I have to trim the floating leaves every few weeks because I have other plants that need light, and more active fish. If you trim the floating leaves enough times, eventually it will stop producing them and you will have a lovely collection of thick large leaves near the bottom. I have seen the leaves sprout and grow halfway to the surface in 1 day. The bulbs are LARGE - 2 inches diameter, at least. They are often marketed as Water Lily Bulbs.
Do not put them in tiny tanks. They will take over extremely quickly.