Yes, that's what I did to cycle my new 29 gal tank. Seeded substrates, plants, decos and the old filter media into the new one. Only took me about week to fully cycle it. Thumbs up for Prime~ I'm a fan of corydoras too, they are so adorable and looking forward to getting more panda corys soon. As for the snails, I had the same kind, it's just so hard to deal with after it got out of hand. so that's why we decided not to keep them. We gave a few of them away as well, and even tried to give them away to a couple stores but no one seems to wanna take them, so we have to put them down. I really sucks, because I really like them. And yes, whenever I see those baby snails, I can't help but to think they are sooo cute. I really wanna keep but, oh well. We don't want anymore complications in our tank. Lol~ I used to feed them twice a day when they were on our 10 gal tank but now, I feed them only once a day too. I figure it'll be okay with just that. Also, for those snails that doesn't reproduce by themselves, we thought of getting them but since we already have 2 otos as my algea eaters, it should be ok. I'll just have to work extra hard whenever we're doing PWC to removed extra algea. I scrub and rinse our decos at least once a month, sometimes twice.