which one of these would be best for the back of my 2.5 gallon betta tank..??

[kngiraffe]

He's red and the rocks are black. The only downside is he flares at just about anything that I put back there. I'm thinking about moving his tank tonight.
But here are the pictures;
1.
2.
3.
4.
5.
I definitely would appreciate the feedback and advice!

[MaisyDawgThirteen]

Number 3! It look nice! :D

[kngiraffe]

Thank you! I'll keep that in mind! :D

[scrap]

4 provides a good contrast to make his colors pop, and lightens up the black-bottomed tank.

[SpookyTooth]

I really like four. It's bright, airy and as mentioned by scrap, offers a lovely contrast.