Recent content by biogeek

My KH was at 11 (~200 ppm) this morning. My GH is off the charts. Our water comes from a limestone aquifer. Calcium literally particulates out of the water column when we freeze it for ice and that's after going through a filter in our fridge. I think I figured out the fish I'm going to do...

Like other Poeciliids, telling the males from females is pretty easy when they mature. These fish exhibit internal fertilization which requires a copulatory organ. The male's anal fin (bottom of fish) will fuse into a gonopodium (looks like a stiff single sword-like structure). The female's anal...

I am specifically looking for suggestions of plant and fish species suitable for very hard water and medium light. I'm not a fish newbie, per se, but I have never been overly serious in the aquariums I keep. Of course my tanks are healthy and well-maintained (I'm a biologist that works in a fish...

Hello all! I have enjoyed reading various threads on this forum for quite some time and decided that perhaps I should just join the fun. I am a grad student in Biology, specifically, I study behavioral ecology in aquatic systems. I work in a lab that researches sexual selection in mollies and a...

Just wanted to put in my two cents on this as I actually know the answer (amazing). There are a couple of unisexual live-bearing fish species, one of which is the Amazon molly. Amazons are a species of hybrid origin and initiate egg development by mating with a male of one of the two parental...