I kept six from last year, put them in a 100L with 2 x39w T5s, and I've had so many, I've had toto compost them monthly.
I tried twelve really big ones out in the pond two weeks ago, but it was obviously too cold, or I should have hardened them off first. Anyway, I've kept the twelve biggest and healthiest, and I'll try again at the end of the month.
The hardest thing with WL indoors is taking them out to clean the tank and putting them back in. The growing etc just happens !