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How much aeration needed?
Koi-lo wrote:
"Gill Passman" wrote in message .. . Koi-lo wrote: "Cliff L" wrote in message oups.com... It's more natural than a plain glass bottom. True, but I wonder how common a gravel subtrate is for aquarium fish in the wild, as opposed to mud or larger river stones. ====================== That depends where you live. Here the river bottoms are covered with stones and pebbles of various sizes, the soil washed downstream ages ago. On L.I. the ponds and inlets were sand, pebbles and stones. The lake here has a mud and rock bottom. If memory serves me rightly, the bottom of the Thames is squidgy mud with the odd bit of stone/gravel but predominately mud...used to get stuck between your toes - lol. It was a long time ago when I was mad enough to swim in there but I'm pretty sure that it won't have changed much.... ====================== Your Thames then is much like our Hudson and East Rivers in NYC. Those rivers have a sludge over the soil and whatever boulders, stones and pebbles are there. You can well call it squidgy mud. And we have trash! Ugh, trash of every description from broken bottles to used baby diapers in those rivers. Very nasty stuff you don't even want to put your feet in.... :þ The Thames has been through some major clean ups but I rather fancy the seventies were the hay day in terms of safety for swimming (not that it was safe we just didn't know any better)...I wouldn't let my kids swim there now but that might also be down to us understanding the dangers of swimming in a river such as the Thames with all its currents without considering toxicity which I don't really believe is a major issue these days...There is no real junk issue in the Thames or the majority of our major rivers...trash in the odd pond/lake/river/stream - yes it happens...but the environmental people are so much on the case now that it is the exception rather than the rule.... Gill |
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