new tank cycle oopsie

[crezelda]

so i got a 20g to upgrade my 10g, and really made a mess of cycling it.

I added a bag of new gravel, 1/4 cup seasoned substrate, 5 gallons of old water from the 10g as well as vacuumings off it's gravel to make ammonia, 2 clumps of java fern, and heres the problem- 2 pill shaped sinking cory pellets

the pellets gotSAPROLEGNIA

Then they broke appart into a million pieces of icky.
what have i done so far?
last night i did a 75% WC and vacuum, today i did a 50% and a vacuum, scrubbed the ferns as they gathered a lot of the stuff in the leaves and roots ( still has some)
rinsed out filter cartridge

turned heat up a bit as i read its a cold water fungus
theres still the odd floaty, i'l prolly do another WC in a bit to chase after them

what else you think i need to do before its safe to move everyone in? i should have just bagged the fish, and dumped all thier water/substrate straight into the 20g.... /sigh

Oh and what i have now is 1 CT male and 3 pepper cories + a clam
gonna get 3 more cories for my current ones to feel happier

should i get neon tetras or cherry barbs?

[crezelda]

LFS said just let the remaining stuff run it's course. i might saturate a cup of tank water with powdered flakes, and strain the chunks out and pour the dissolved food water in to try again

[crezelda]

got my amonia up to a 3 by mashing goldfish flakes and straining it thru a tea bag, but it made a film on the bottom that just molded up again.... how do i clear the mold for the fish while maintaining a cycle?