Post by parker002 on Aug 9, 2013 8:56:09 GMT -5
My waterfall has built-in filtration - water is pushed into the bottom of the basin and then up through the filter media until it eventually spills over the top.
I'm used to pulling up the plastic grates and finding 1000's of clumps of snail eggs. However, yesterday I pulled them up and found none. In their place, I found some strange little paper-like cones.
At first glance, I would say they look like some kind of freshwater crustacean, like a barnacle or something. However, most of them are empty, so I think they are some kind of insect egg casing. They're firmly attached - they don't just wash off and even scraping isn't highly effective.
The grate that they are on sits underneath all the filter media and is exposed directly to the outflow hose of the main pump. So they have no light, are submerged in almost a foot of water, and sit in an area where water is moving at around 4000gph.
Any ideas? Here's some pics:
I'm used to pulling up the plastic grates and finding 1000's of clumps of snail eggs. However, yesterday I pulled them up and found none. In their place, I found some strange little paper-like cones.
At first glance, I would say they look like some kind of freshwater crustacean, like a barnacle or something. However, most of them are empty, so I think they are some kind of insect egg casing. They're firmly attached - they don't just wash off and even scraping isn't highly effective.
The grate that they are on sits underneath all the filter media and is exposed directly to the outflow hose of the main pump. So they have no light, are submerged in almost a foot of water, and sit in an area where water is moving at around 4000gph.
Any ideas? Here's some pics:
