07-27-2006, 09:22 PM
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I guess it depends on what you mean by cleaning the inside of the tank. For the bottom I would have to recomend cories (Corydoras). They are great cleaners of left over food, and from my experience are not aggressive at all.
For the walls and deco's in the tank, take a look at the Otto's (Otocinclus affinis). These little buggers will eat their weight in algae. These guys run small, and once again in my experince are extremely docile.
I have owned both of these and have good experiences with both. Hope this helps.