probably no "dangerous" as such, (although maybe in an uncycled tank, its just polluted water and bloodworm poo)
more just excess nutrients that are suspended in the water column
I have had trouble reacently with this brand and am bringing it up with the rep next week
I would suggest going for the computer controlled types such as the Aqua one advance, Jager etc... as they are less likely to fail due to faulty metal strip thermostats.
I also like to keep a spare plastic tank and an air pump (battery operated one) for emergencies
depends on if you decide to go with live plants or (boo hiss )plastic
best to keep a schedule for lighting to prevent stress, and to prevent algae blooms though
btw how did the plants settle in???
28L is probably too small for all but 3 chain loaches, better off using it for 2 or 3 dwarf puffers, you won't be disappointed,
http://youtu.be/6o1fw9jtRNc
the UV will clear up your green water in a day or so, but it won't treat the cause of the green water, it will more likely add to it
it works better as a preventative than a cure, even for parasites.
btw ime cats are fine and healthy till they disappear and die, fish are a lot easier to tell with
gotta love kissing fish
can be pre spawning behaviour, or just regular sparring. it looks even funnier on jurupari's cause of their horse faces
have bred jurupari's in pH or around 7.8 before so shouldn't be an issue, plus most are tank bred nowdays anyways. keep an eye out for lil babies hiding in their mouths
btw love the tank setup for them, they must love the sand
playing with the pH can cause issues, all of those fish will do ok in pH of 8.0
also seems strange to me that you have a green water problem and a nitrate reading of 0
also, in the long run your angels, loaches and rams will either eat or bully your bumblebee gobies.
you might have had an internal parasite that got released when the first carrier died, or you might have had a mini cycle if you have tried using any algae rid products due to the increase in dead and dying algae
best course of action if increase PWC's, make sure your tests are correct and keep an eye out for any potential symptoms
Golden algae Eater, golden form of the Chinese algae eater
found this quote from William Berg
as for telling them apart, I believe other than the fact females are fatter, the males get bright red "horns" on their noses
(I got a male in my display tank that has massive horns, might hunt for a girl for him.....)
how big is the tank???, loaches really need to be kept in groups or else they tend to get depressed (yes seriously, if you have ever seen a loach that has been seperated from his mates the you will understand)
and don't get sucked in by the store assistant who recommends Clown loaches as they get too big for many tanks, try the striatas or chain loaches, these are the most common of the smaller snail eaters. there are plenty more out there, just make sure you research their maximum size well