Since no one has replied, I will - you should realy have posted in the gouramies and anabantoids section but nevermind
I wouldn't go for dwarfs for two reaosns. first of all, dwarfs, as you may or may not know, tend to be very fragile and prone to disease. it is stress that'll typicaly set this off. (BTW, quarantining dwarf gouramies is a wise move). With nippy serpaes and active, top-dwelling danios, a new dwarf would very likely feel stressed. Don't get me wrong, serpae usualy are of little threat to a dwarf gourami but they are still stressful tankmates to live with when you've just mvoed in. As for the danios, they aren't too bad but, as they like the top layers just as dwarfs do, they can be annoying for the territorial male. The second reason is just simply their fragile nature. If you can quarantine, this is not a very substantial argument though so I'd still get one (or a trio - 1 male, 2 females - is better still). To over-come the stress issues, just plant heavily and include floating plants and a gentle current.
Alternatively, do what i would and get yourself a different species of gourami instead
Normaly I'd suggest pearls - but not with serpaes. Consider getting a trio of honey gouramies (Colisa chuna/sota) or a trio of abnded gouramies (Colisa fasciata). These last ones grow to 4" and are also known as 'indian', 'striped' or 'giant' gouramies (not to be confused with the 'true' osphronemus giants which get to 30"!). They look simialr to dwarfs though females are brighter than dwarf females and they are far hardier than dwarfs. A lot of people over-look them, it seems, but they are not uncommon in most LFSs. I don't know whether you live in the UK or not but even Pets At Home (who usualy only sell your 'bread and butter' species) sells them.
