It's getting way to hard to choose fish, please giv

 
It's getting way to hard to choose fish, please give me some suggestions/ feedback?
So here's the tank details:

- 30 gallon [(36" long, 14"wide and probably 15" tall) 120 litres]
- 200watt heater (will probably be getting a better quality one like an ehiem)
- fluval 205 filter
- low light (if i need stronger obviously will upgrade)

Decor:
- live plants, anubias, crypt, dwarf hair grass
- terracotta pots
- lots of wood
- rock
- plain brown gravel (would love a sand substrate)

Stocking at the moment:
I use it as a grow out tank for kribensis, great fish big mistake breeding :P, so once i get rid of them all (parents included) i am going to change the stocking.

NOW FOR THE QUESTION AT LAST!!!!!

What do you think i should do with the tank. I'm willing to do anything (even marine). But basically the most important thing is I DON'T WANT ANYTHING TO BREED. I'd love cichlids but i don't want them to breed and they tend to do that. pets question and answers,www.5d2d.com

My Ideas:

1) Mudskipper tank, probably what i want to do most. I want it to look really natural, so no plastic or even fake plants. 50/50 water land, i'd make this look really good and natural.

2) A low light planted amazon theme with catfish (something cool like a royal whiptail) a pair of apistogramma iniridae (apparently they're really impossible to breed), with a school of one type of tetra, on a fine brown gravel substrate.

3) Marine with just a pair of ocellelaris clownfish and maybe a sixline wrasse with just live rock, and protein skimmer, upgrade to good lighting to maybe then move to an anemone in the future

4) A type of small earth eater cichlid maybe a group of three female red hump earth eater and a school of nice tetras (bleeding hearts or something), lots of branches, sand substrate and tannin stained black water)

5) Asian community, rasbora, yoyo loaches, dwarf gourami, sand substrate, anubias etc (not to keen on this myself)

6) oddball species tank with just one fish(any suggestions, maybe a medium sized puffer if i could find one) pets question and answers,www.5d2d.com

Thats all my ideas what do you think?

thants
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for the mud skipper tank senc mudskippers are brackish water i would get a couple dragon gobies to exsplor the bottom senc mudskipper leave water. trust me dragon goby and mudskiper get along very well.

senc its a 30 gallon you cant have to many big fish probly nun at all. so a nice school or neon tetras black neon tetras and cardinal tetras with soem kuhli louches and maby some shrimp would be pretty kewl. and color full.

if you what an odd ball fish i would recomend the dragon goby witch is brackish water and then get your mudskipper and then you can even get som dojo louches. altho dragon gobies get big you could have one in a 30 gallon for quite awile. pets question and answers,www.5d2d.com

now if th etank was mine and i wanted no fish that would breed or if they did breed but the fry would get eaten i would go with lots of neon and cardinal tetras 5-6 kuhli louches snail or 2 shrimp and some glass catfish.