the sparkling gouramis grow to 1.5 inches or less.
the honey gouramis grow to 2 inches or less
so I don't think you are overstocked. also these gouramis are much less aggressive than the dwarf or giant gouramis.
I would put my money on the pleco like the first poster said. plecos love the slime layer on carp. they should not be kept with golds (fancy or common) or koi
yes putting the new tank will help a lot it will simulate a partial water change. I have done that before with no problems. also use the old filter and gravel and decorations. those will help too.
yes, you have small fish the tank will naturally cycle before those tiny fish will produce enough...
yes putting the new tank will help a lot it will simulate a partial water change. I have done that before with no problems. also use the old filter and gravel and decorations. those will help too.
yes, you have small fish the tank will naturally cycle before those tiny fish will produce enough...