i have had freshwater for many years (15+) always you have to be careful what you mix in fw or sw (i am just getting started in salt) you must have read by now to use tap water, yes that is what you do lake vs ocean or fresh vs salt. i always used stress coat to take out the impurities and that worked VERY well for me. my last 2 tanks were agressive, the last being CONVICTS which are of the cichlid family. now, from personal experience DO NOT get these fish UNLESS you want to have lots and lots of baby fish
, they multiply like underwater rabbits!!!!! i started out with 4 and ended up with well over 100. and you cant even give them away, the lfs really are not even interested.
convict cichlids are one of the few fish that i know of that you can tell the --- of the fish. the females have a red sort of belly and when they are ready to lay eggs the get some bright blue vibrant color to them. they ARE beautiful fish, they do not eat their young so thats where you get alot of population. i had to get population control (ie jack dempsy & oscar (i had no problems but some say not to mix them)) sorry to get off the subject, but everyone has been so helpful to me here i just wanted to offer some personal experience of my own.
also there are some freshwater forums that might help you out better than here.
ps convicts are VERY hardy fish and good to cycle your tank but like i said they are agressive and you wont want to mix them with tropicals
hth