This is my "low maintenance" 20 gallon in the living room. No CO2 and just a 40 gallon sponge filter. The filter
is placed on a terracotta houseplant saucer full of gravel, and it's gradually being covered up by plants, as is the Fluval
heater in the back. I put up the tank earlier in the year in March. Has a 24-inch Hygger light (love 'em!) set to an 8
hour day. Sometimes I'll use the moonlight setting if I have guests that evening.
Livestock consists of 8 black neon tetras (wanted seven, but the shop assistant caught 8 and didn't want to sort through them
again, lol, so the last one was free); five lemon tetras -- was six, two males and four females, but the dominant male killed the other one! Don't let anyone tell you lemon tetras aren't aggressive -- : the one always-horny male hounds the females, so they are constantly in hiding in the plants; and, finally, three otocinclus that show up in the corner for algae tabs (as do many snails that snuck in with the plants). I know the lemon tetras spawn regularly, as the black neons follow the amorous couple around, eating the eggs.
They get the same tetra diet as my main tank, TetraMin flakes and bottom pellets, varied with dried Daphnia, Brine Shrimp, etc.
I add spirulina flakes since the otocinclus are in competition with the snails, and also because the fish are omnivorous.
For ferts I use Flourish root tabs and the occasional potassium and iron additives. I have about an inch and half of gravel
covered with Stratum, hoping the gravel will prolong periods between water changes. I still change six gallons weekly, although
when I went away for a month's vacation, they did alright for a month without any, while family and neighbors fed the fish.
It was totally covered in plants when I returned!
Just did a water change and a pruning. Anubias, elodea, monarda, some still small crypts, spiral vals, s. reprens, amazon compacta and regular swords all came from my 24 gallon tank, and I threw in some bulbs which I thought were dead for a while, but the onion came up. The red lotus did not (needs cooler temps to sprout), so I bought a small bulb with a tiny leaf a few weeks back. Tales of fast growth with this plant are true! And speaking of fast growth, guppy grass fills the many niches and is constantly being cut and thrown out. No floating plants, as the sponge filter keeps the surface too agitated. Bits of guppy grass will float around until they grow big enough to sink. The sound of the bubbling in the living room is very relaxing.