the_lock_man said:
My fish are
1 wagtail platy
6 black mollies
4 glofish
1 albino sailfin molly
3 whiteclouds
1 giant danio
And 2 head tail lights
They are in a 20.5 gallon tank
What oddball can I add?
Nothing, need to sort your current stock out a little first. Not sure what a head tail light refers to, giant danio is too big and should be kept in shoals. Whiteclouds if referring to minnows prefer cool temps, Molly's do best in a brackish setup. If Glofish are dyed i'd then i'd take them back to where you got them from.
Agreed with the "nothing" part. To clarify for anyone reading who's confused.
1) Head & Tail Lights are tetras - as such they ought to be ina group of 6.
2) Giant danio and white cloud mountain minnows are both shoaling species and prefer temperate water.
3) Sailfin molly needs a bigger tank than 20gal
4) The part about mollies doing best in brackish conditions is the poster's opinion, there is plenty of debate around this issue, however if they are not in brackish water, then they do need to be in hard water
5) Glofish(R) are genetically modified zebra danios, again they are shoaling species, and prefer temperate water. They have had the colour genes of a jellyfish (IIRC) inserted into their DNA, which produces the artificial colouring. They aren't dyed. They are still, in my humble opinion, an abhorrence, and should, again in my opinion, be boycotted. There are plenty of beautiful fish which occur naturally, without having to manufacture these things. They are illegal in the UK.
Part 1 - Didn;t know this, good reason to use proper names for fish i guess

Part 4 - Like you said theres debate on this but if you need to have specific water hardness for them to thrive in freshwater yet they thrive in brackish water avoiding extremes then i'd take that as they're a brackish species. Like you said my opinion
Part 5 - How do they get the Gene's into their DNA? Can't imagine it's pleasent either way
