Silver dollar question: my silver dollars look sick

» jstrauss - my silver dollars look sick

i recently added "proper pH 7.0" and changed out some of the water . . i also used a tank clearing solution... and i try to change out the water as often as i can (about once every 2 weeks)

i introduced an Angel fish.. about 2" with 3 silver dollars, among other things.. the last time i changed the water my two year old barbs died.. then i had to replace them with 2 more silver dollars so the one left would have company.. i bought an algae eater that is now dead with having plenty of algae left to eat... had it for about 2 weeks..

question is how do i keep the silver dollars alive? they've got many white spots all over them and they're tending to almost rest on the bottom of the tank... the large one and one of the smaller ones will eat, but there is one that has stayed in hiding... my guarami's look healthy and the angel fish is healthy.. i also have a dragon fish and a dinosaur eel.. they all look fine, but my silver dollars are dying! Please help!

-- posted by jstrauss