Inside has only really seen diatom growth on the first couple of inches of visible glass (plastic), Part drain, then give it a wipe with a sponge. (Part drain else when my arm goes in, displacement...)Starting to look very nice How do you keep the glass clean with this sort of thing?
Edit... Plus I now seem to have a small army of limpets trying their best. There's no intentional creatures in there yet, so I guess there's not much muck in there either