Is the stocking in your sig correct for the 100L
yes it is now
100 liter-2 fantails,3 leopard danios,2 zebra danios,1 guppy,1 platy,1 weather loach and chinese algae eater.
With the above i would move the platy and guppy to the 80L, at the present temperature these will be subject to disease and have a much weaker immune system so will be better suited to the 80L,
Chinese algae eaters are known for sucking on the slime that coats goldfish leaving them susceptible to disease, they also get extremely aggressive as they age, and ultimately aren't a small fish once they mature, Therefore personally I would rehome this fish as and when you have the opportunity,
The weather loach will also get to be a big fish and may need rehoming at a later date if it does get too big,
Thus leaving you with 2 fantails, 5 Danios and temporarily at least 1 weather loach, which provided you do weekly water changes of 30-50% should be manageable
and while its still not perfect, is still a great deal better than the conditions most goldfish are subject too,