about germination..

Too much water I believe. You are suppose to het humidity, not water. I really suggest you to try seeds directly in soil, I had no fail germination with it....

Age of the seed and heat can effect germination

I don't like the dark color of the seeds. Once the root appears it should grow pretty rapidly. If the root emerges then stops... it's not a good sign. I do not like the paper towel method the seed companies promote. I find it way too easy to keep the seeds too wet. They turn dark and don't germinate at all or they send out a weak root that just doesn't thrive. Now I soak my seeds in water for 24-36 hours. Then I plant them (I grow in soil).

Hola amigo , se nota que tiene mucha agua ese recipiente y ese papel absorbente . La idea es dejar las semillas en germinación con el lugar humedo ( no mojado ) a unos 20C ... Lamentablemente quizas se pudrió , o tiene ese aspecto , que pena u.u...podria estar germinando otra semilla psra reemplazar...saludos mi amigo y ánimo!

they aren't looking good at this point. the one with the tail almost looks like its been too saturated for too long. if i were you i would start with fresh seeds. if these are all you got, i would put them in your planned final medium or a rockwool plug or something similar so that they can get a decent amount of oxygen yet stay moist as well. unfortunately, i dont think these are likely to make it - BUT i have had a couple seeds make it into decent plants from seeds looking like this after a week. good luck!