Personally I would avoid honeys, have some nice adults that are pushing the 5-6cm mark... thats pretty heft in so small a tank.
I had an edge for a few years (moving 3 times in one year meant i gave it up 4th time round!) and heres afew notes i made:
- Avoid anabantoids as there is very little surface area and the little that there is has the HOB filter chucking water down at force... (sparklings appear to be the exception but their behaviour is different to 'normal' gouramis)
- Avoid sand unless you have ornament/wood/rocks in the middle as filter blasts sand out the way lol.
-Ignore all instructions on changing filters, dont ever replace the biomedia or sponge unless its an emergency (even then, only sponge) and keep filter on full speed, slowing it down lowers life expectancy of pump andlower turnover of filter meant tank was never that clean...
- Clean pump/impeller at least once a month! Tiny pump = more frequent cleaning.... if it goes.. can be a nightmare to replace if you have to wait a few days..
- 3 products that works great in the HOB filter... Evolution Aqua Pure balls (fit in by the flow adjuster), Polyfilter (not cheap and aimed at marine but if you cut tiny cube and put it in by flow adjuster... it strips out EVERYTHING bad) and last but not least... the Greenex 'teabag'... really does help with algae (though Polyfilter does this too...).
-Dont bother trying to grow plants... the LEDs as standard are barely up to scratch and the shape doesnt help... that said, cryptocorynes seem to do well and you get such a huge range of them and colours that they do the job... C. nevelli or C. amicorum are tiny and dark green, C. wenditii 'brown' is a lovely purple colour and so on.. you can mix in anubias var nana as well.. Dont bother with anything that grows tall as with 20cm max in that tank if that, you're just giving yourself hard work...
- Keep stocking very basic
- I found 4 male cherry barbs, 2-4 sparkling gouramis, 3 male endlers and small shrimps all looked great in the tank