Help with tank mates

[SundowNXX]

I have quite a heavily planted 30 litre tank that has been set up for about 2 months. At the moment it just has 6 Otocinclus and a butterfly plec in it, in time I am hoping to add red crystal shrimp and have them breed but the sand at the bottom and around the plant stems is gradually filling up with waste from the fish. I was wondering if there was some kind of corydoras or bottom feeder suitable for a nano tank, that wont uproot the plants, wont eat shrimp and with help with this waste problem.
There is quite a list of things that cant happen there but if there isn't a fish maybe there is some other method of controlling this, I have tried siphoning off this layer but I inevitably take off a layer of sand and well eventually i'm going to run out of substrate...
I would appreciate any help.
Thanks

 

[Themuleous]

Not really much you can do fish wise, anything you add will just increase the problem.

Have you tried syphoning using airline hosing? Being smaller it doesn't have the smae sucking force of bigger piping and so you can be more accurate and get closer to the sand.

Sam

 

[SundowNXX]

That's a very good tip, i will give it a go, thanks.