Choosing a top dweller for 20 long
I have a 20 gallon long, intensively planted - 50/50 mix of Eco Complete and fine gravel for the substrate. Low light, fast growing stem plants, a couple of crypts (wedtii - that never melted! Yay!) I have floating stems of pennywort that cover about 25% of the surface.
I use Seachem Flourish, root tabs, API Leaf Zone, and 1/2 dose it every other day with API CO2 booster (the anacharis started melting at full doses, so I cut the dose of CO2 booster, and all seems well).
Filtered with a Lustar hydro sponge 2 and a Tetra Whisper 20i. Temp runs 74/75F.
Livestock is 6 neon tetras, 10 harlequin rasboras, and 6 emerald cories.
The tank has been running for two months now - has never shown nitrites or nitrates, and ammonia has only intermittently been a shade between 0 and .25 ppm. pH is 6.8.
I'm looking for a top dweller and think that either a male dwarf honey gourami or a male dwarf gourami might be what I want, although I'm thinking the dwarf gourami (Trichogaster lalius) might get a bit larger than what I'm looking for.
I've kept larger gouramis in larger tanks, but never the small ones. I understand they are a bit skittish, and like cover, so my tank should be okay in that regard.
Do you really need to keep them in threes (1M/2F)? That's going to get uncomfortably close to 100% stocked, and I am really not looking to breed, or to have the other fish chased out of a "territory."
If that's the most humane way to keep them, then what other suggestions do you guys have for a top dweller in this tank?