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You can keep the tiger lotus to the size you want by pinching off at the base the leaves that grow too tall. Have a height in mind that you want to keep it and then remove all leaves that grow past that height. This will train the plant to stay small (this is a lot like mowing dandelions, they grow to stay below the point they keep getting cut). Occasionally the plant will try to send up taller leaves again and you need to remove them when that happens.
That said, tiger lotus don't need high light and CO2. 18 watts over a 20H is really low though and I don't know if that's enough for the lotus. You can check the PlantFinder (upper left of the page in the gold bar) for more information on Nymphaea species.
That said, tiger lotus don't need high light and CO2. 18 watts over a 20H is really low though and I don't know if that's enough for the lotus. You can check the PlantFinder (upper left of the page in the gold bar) for more information on Nymphaea species.
