Here's my 20L, it is a fun little tank. It is about 4 months old and it looks like coraline is starting to grow. The gravel was old, but cleaned substrate. The rocks were from a mature tank (and likely already had a softy growing on it).
All softies, with the exception of one orange acan (front and centre). There are currently four fish, three clowns and a clown goby. There are a couple toadstools, nepthea, finger leathers, GPS, blue sympodium, I think a kenya tree, a cabbage, maybe the pipe organ is still alive, lol, anyway... I put a lot of different pieces in at first, but caught an aeolid flatworm a couple months ago so I haven't added or removed anything since. This has caused the mushrooms to not reproduce (and a few died off, unfortunately). I was hoping to get a Blue Velvet Nudibranch, but I think I'll have to settle for flatworm exit...
The ATO is a gravity fed via the float valve in the back right. The light is a generic black box. A single heater, ideally one would have two heaters, but I'm moving it in a couple months so I didn't go all out. A flipper nano for glass cleaning. For flow, I just have a simple 100GPH pump, currently on an Odyssea Clean 100 'filter' which is supposed to surface skim. However, the bracket doesn't fit over the rim (I guess it is designed for rimless), so it just dangles from a zip tie. You might need more than a single small pump if you are going to have LPS.
The glass is dirty and I didn't "scape" this tank at all, I just threw everything in. The photos also, as usually, don't do it justice. But it does make for a fun and easy tank!
