My 4 yr old likes guppies, and wants to put one in "her" reef tank. I know they can be acclimated to SW, but I am not sure if they are reef safe. M...

I didn't even know that guppies could be acclimated to SW. Are you sure you aren't thinking of mollies?

I have personally acclimated them as high as 1.018 and they were fine for 6 months. They were meant as food for my BW puffers but puffy didn't care...

yes they can be aclimated to sw. they shoudl as they mature be aclimated to bw (1.015-1.018 ) becuase in their natural environment they swim down r...

I have a trio of guppies in a tank up to 1.019. Soon to be up around 1.022. They acclimate fine (mine were dumped right in, because they are for fo...

The key is going to be gradually bringing up the specific gravity of the water with each weekly water change, until the guppies are acclimated to f...

Aren't guppies and mollies scavengers? That would make them benificial additions that have very little impact on the tank.

They also eat algae. Mollies being a little bit more fond of it. If you put a pair in the tank they also provide bite-sized dinner for corals and o...

I wonder; if if it is so bad to feed FW fish to marine fish, would keeping the guppies in seawater change their nutritional value?

I would think so. As well as changing their diet. Sort of gutloading them, over time.