Ideas for spare tank

[Palm Tree]

I never thought I would ever say this but I have a spare tank :0
I just don't know what to do with it now, its 50x25x25cm tank. Not using it is not an option lol.
I want to do something biotope specific, fish don't really bother me but I want a theme.
Please post up some ideas I cant think what to do for the life of me.

 

[Arana]

why not go for a native theme, native plants and fish, minnows would be great and you could keep it coldwater. i think it would be quite a challenge

 

[Palm Tree]

I have actually been planning to keep some Phoxinus phoxinus sometime, but my room temp is 19-22c so I won't be able to do it. They also grow up to 4'' so they're too big
I'm tempted to do a blackwater creek/rice paddy them with a Betta splendens and only use crypts, but I'm not sure.
Decisions decisions ...

 

[Palm Tree]

Have just filled this tank with 18 8cm peat pots from poundland with moler clay in them and about 10 cuttings of Hygrophila salicifolia. I'll let them get rooted and growing, them put then in the greenhouse when things perk up. I can't wait till summer .