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Hi Flynn, I haven't tried this method myself, but I've seen others do it, and it seems to work quite well as long as your starting water is fine and you've done your research. The 'sealed ecosystem' bit has me worried though - shrimp (and snails? probably ahaha) need oxygen, and if you plan on this lasting very long, I don't think it'll work if it is fully sealed. The plants also need natural CO2 to grow, so limiting their supply of it may not turn out well. When fish and shrimp are sold in non-breather bags, you have to be mindful of how long you're transporting them for - not for lack of food, but for lack of air. Mind, that is a more stressful environment, hence they ventilate more, but you'll still have them in there for much longer than they would be held in a bag. Hope that helps, Crabby

Not sure where JLB is based, just guessing?? I found this seller in Australia but they are out of stock at the moment, but as JayC states, they must be available in Australia! I don't know anything about the reliability of the seller as I am the othe side of the world? https://abquatics.shop/collections/caridina-shrimp/products/tangerine-tigers Simon

Tangerine tiger are in Australia. Just need to find someone who has them and would like to sell some. That's the difficult part I suppose.

sdlTBfanUK & Crabby Thank for the insight and wisdom.. I just may need get a sep tank for the guppies... and will look for the Tangerine Tigers is there another common name for them ?

I’ve read on forums that people have successfully kept and bred shrimp in sealed ecosystems for years and years. You grow out the plants in a big jar for a month or so before adding the shrimp and sealing it. The shrimp eat the biofilm, moss and algae that you are growing inside the jar. The shrimp and snails create CO2, the plants use that and create oxygen. It has to be very heavily planted though as the waste from the shrimp needs to be broken down. Sent from my iPhone using Tapatalk