Snails Snails Snails...... poxy Snails......
Anyway, hi.
You've probably got some of these:
Physa Fontinalis or Physa Acuta (Common names: Pond Snail, Aquarium Snail, Plant Snail, Bladder / Tadpole / Pouch Snails - Family Physidae") and 100% sure they hitched a ride on one of those plants into your tank. Go back to the shop you got those plants from and tank a good look at the holding tank - crawling with them I bet. Personally I'd then complain!
See here to ID any snails:
http
/www.fishforums.net/index.php?showtopic=75554
Why I consider unwanted snails, pest snails...They breed exponentially (usually 20-30 eggs to a clutch, 90% of which will mature, Each adult may lay 50 to100 eggs weekly for up to a year). As a result they will suck the life from the tank and kill most of the inhabitants. They are also dirty and will foul up the substrate, eat plants. They are carries of worms aka the intestinal worm parasite: Echinostoma Cinetorchis. Infection results in gastrointestinal symptoms like nausea, vomiting, abdominal pain, and diarrhoea. These snails should be removed on sight!
Do NOT crush them when in the tank as this may release any eggs.
The good news - is that you have no fish or more imporantly shrimp or 'pet' snails in your tank. This means that getting rid of the snails is a HELL of a lot easier. Since you have no fish, this means that your filter will be dead. i.e. no bacteria in it (because there is no ammonia because there is no fish).
HENCE
IF and I stress 'IF' you are NOT currently cycling that tank (i.e. by manually adding pure ammonia, i.e. fishless cycling) then this will kill ALL snails AND their eggs. Dead. Goodbye snails: A 10 minute bath in 10mL per Gallon of Potassium Permanganate will kill everything, bacterial & snails alike. Get Potassium Permanganate from:
http
/www.gardendirect.co.uk 10 mins should be enough and your plants should be OK. Once done, do a series of 100% water changes though!
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I do not advocate using copper based chemical solutions (because of the copper - it's a pollutant).
I am currently experimenting with Flubenol 15 (which does NOT contain copper) - seems to be working but needs a 4 week course because I don't think it kills the snail eggs.
All other approaches just do not seem to work or are practical.
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GL
Andy