Growing plants underwater.

This is a suggestion from the early days of the project that I've given a lot of thought to and decided to pursue. I won't make the colony reliant on plants for air as that would endanger the hamsters. However it will supplement the air, act as a backup food supply and be generally neat as fuck:Why clover? Why not blue green alage? Well, a couple reasons. Clover thrives even in dry conditions, meaning I don't have to water it often. It also thrives with minimal sunlight, meaning even a meager blue/IR LED array will suffice. Last, hamsters love it. It's a treat for them, as there's a sort of sugary nectar inside the leaves and stem they really enjoy. By comparison blue green algae offers efficient production of oxygen (a function we don't need) but cannot be eaten, and is more difficult to successfully cultivate.

So, for our purposes, clover seems ideal. I can simply spray the "crops" with a mister every time I raise the colony to clean out the other parts, and the lights will do the rest. This does mean I'll need to add a USB power cable to the umbilical, however. But given that I'll soon be dremeling out a 1.5 inch hole in each enclosure, and given how perfectly silicone sealant seems to protect against water getting in, I'm no longer skittish about breaching the habitat walls to pass cables inside. Any idea where I can get a 24 foot long USB extension cord?