No fish can live successfully in a bowl. Far better you either throw the bowl away or use it as a vase. If you really want to keep fish get a reasonable sized aquarium to keep your fish in. There is a basic rule that all successfull fish keepers use and that rule is "1 inch of fish needs a minimum of 1 gallon of water" For you to keep 2 Tetras successfully you would need at least a nominal 5 gallon tank with a heater/thermostat (set at 75F), thermometer, Cycled filter, coverglass, Lights, gravel, and live plants.

FFPE (Formalin-Fixed Paraffin-Embedded) preparation includes a series of steps. First, the fresh collected tissue is immersed in a formaldehyde (formalin) solution to fix the cellular structures. This fixed tissue is then dehydrated with a series of alcohol dilutions and cleared by using a clearing agent. After that, the tissue is embedded in liquid paraffin wax. Finally, after the wax solified, the tissue wax block is sectioned into thin slices using a microtome. For further analysis, these since slices can be mounted onto a coverglass.

To learn more about FFPE samples, I recommend to check out the FAQ on our website where we offer human tissue samples:

centralbiohub.de/biospecimens/cancer-samples/ffpe-samples