half ton
Legendary Knight
Sorry if this sounds boring but I had to have a chuckle this evening , I bought a 25 ltr cube fish tank 3 weeks ago, And having done all the preliminaries (planting adding water stablizers etc) I put in 6 Pygmy Corydoras ( cute little feckers that are only 1" long) . as an after thought I have added an airstone to help with oxygenating the water ............ just looked at the back of the tank where the stone is and they are riding the stream of bubbles like a bloody roller coaster, cueing up to take turns 
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