20 gallon stocking question

[thornious]

Hi everyone I'm new and just looking for suggestions on maybe adding some few to my 20 gallon.

Currently my 20 gallon is stocked with

5 serpae tetras
2 emerald cats
3 marbled hatchetfish
1 silver hatchetfish
1 printed loach


I would like to add a small school of glassfish, but I am worried about the size of them.

I would like some suggestions about what else I could stock.

Description
well Planted with all fake plants
Some real driftwood
A tall fake log/cave that is the centerpiece.

Filters
I am running a marine-land bio-wheel for 30-50 gallon & a Whisper for a 20-30 gallon
I am also using an airstone.

150 watt heater

 

[Devilishturtles]

Maybe a gourami. They can come in many varieties and are readily available. IMO, you don't really have room for another school of anything.

 

[shady3210]

You can fit maybe 1 dwarf gourami or beta in there. No more schools your pretty stocked as it is.