... IF the water is not cycled properly? I put 4 guppies and 2 dwarf guouramis in about 4 hours ago. They seem to be absolutely fine now, swimming around, eating fine, making bubble nests. Is everything good?
Depends on the volume of the tank - the smaller the volume the quicker the chemistry will skyrocket to toxic levels - it could be a day or it could be a few days but an ammonia spike is inevitable.