I've just read all of the stickies on cycling, and while it's been made clear that a cycle is difficult to establish and keep stable in tanks smaller than 5 gallons, it doesn't seem impossible, especially with live plants.
I've got 3 tanks, all 3.9 gallons, currently unfiltered but with several live plants in each. I'm planning to do a huge upgrade/overhaul in the next couple of months, adding loads more plants and generally changing things up and hopefully creating a much more pleasant environment for my fish.
I've seen a lot of hype about sponge filters on here, and thought I'd ask if it's worth attempting to cycle my tanks with one of those, as I think even Falkor could handle the flow of one of those (he couldn't handle either of the two low-flow filters I had tried when I first got him and was fairly clueless about fishkeeping).
It'd be nice to know if it's worth trying before doing this big overhaul, as if it's possible I'd purchase gravel in addition to the things I'm already going to be putting in there... The plants I'll have in there aren't huge ammonia sinks, being predominantly crypts and a couple of different anubias varieties due to my lighting, but I will have a fair bit of water sprite (more than the little I have in each tank at the moment) which I hear is great for water quality.
Unfortunately due to space and financial limitations I cannot upgrade to 5 gallons for each boy, what I have is just about all my furniture and cramped living quarters can handle. If we hadn't been given two bettas as a surprise, I probably could've upgraded Falkor's tank, but as it is this is what I've got to work with...
So, any success/horror stories about attempting to cycle tanks of this size? I'm very interested to hear any points not brought up by the stickies, as I'd like to make as informed a decision as possible for the benefit of my fish.