I came across this neat little 1.3L "mini fish tank" on Amazon when I was looking for a new home for my Opae Ulas. I had them in a glass skull shaped bottle that once held Crystal Head Vodka; Dan Aykroyd's company. I have eight of the shrimp and they were difficult to see due to the distortions caused by the bottle's shape. This little aquarium on Amazon looked very much like the upright oval Ecospheres except this one had a removable base as well as LED's in the base. It's still a sealed system and the product's description states "..Keep the bottom lid of the tank open for 2 hours every 20 days to fresh enough air for your fishes...". That's probably a death sentence for fish but Opaes could tolerate it just like in sealed Ecospheres but we know of the fallacy of Ecospheres providing enough food and air for these shrimp. So I decided to drill a hole in the top of this mini aquarium (which is actually made of some kind of thin plastic) to provide the inhabitants with constant gas exchange. I could have drilled a tiny hole but opted for a large enough hole to accommodate a silicone plug that was previously part of my Biopop Dino Sphere which originally held bioluminescent dinoflagellates. Unfortunately I just learned that Biopop recently went out of business.
This silicone plug has a pinhole in its center. I can remove the plug whenever I need to top off the tank or if I decide to feed them. I rarely feed them since they seem to get all they need from the algae present in their tanks.
The mini fish tank came with a sad piece of black sea fan and some coral rubble. I decided to buy a nicer black sea fan and use some mini marimo balls instead of rubble.
I had to do some trimming on the new sea fan to get it to fit and I had to use some gasket lube on the bottom because without it there was a slow leak.
If I want to open the bottom for some reason I just have to hold my finger over the pinhole. If this isn't possible because I need to use both hands I can turn it upside down in a glass big enough to hold it and the amount of water coming out the pinhole is minimal for the short time I need to use the full size opening in the bottom.
Overall it has turned out very well I think. It looks very much like an Ecosphere and has been in use now for several weeks with no issues. I've attached images of Ecospheres, the ad in Amazon, and photos of my Ecosphere Wannabe.
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Better Living Through Chemistry