Fish Are Dieing!

[Ronananator]

ok so yesterday i wanted to put some more fish into my 57 gallon tank i bought 3 swordtails 4 new danios and a snail in the tank i had 5 guppies pleco algie eater and weather loach so i added my new fish acclimted for 1 hours adding water every 15 min ect i had this guppie with an infected (i think) in his front fin it was like a bump of blood our something so today i noticed he was not able to swim good at all. it looked to me as if he was internally bleeding his body devoloping red spots which looks internal unfortunatly i discoverd him dead about 4 hours later after i noticed his condition =[ im really upset about this loss and i was woundering it there a risk this might spread to my other fish?


my chinese sucker fish and weater loach dont look good at all now there not moving much at all would this be from infected our is it just because loads more new fish and there just getting used to it =/


please help me guys im really mad ! and fustrated that i let this happen to my fish =/

 

[Ronananator]

i just did water test with api 5 in 1 test strips nitrate and nitrite is 0 my ph has dropped from 7.5-8.00 to 6.00 ? havnt added anything exept fish and a plant my ammonia i tested 3 days ago at fish shop was 8.0 but it was ammonium because i had used ammonia remover the shop keeper reasured me that if it was ammonia all my fish would have been dead along time ago and it would have cycled to nitrate and nitrite so he said it was the ammonia remover that changed it to ammonium (non toxic) iv also been doing a small water change in morning and in night for past 2 days
i begg of u someone please help me i dont wanna lose my lovly fish!


ps i have a bumbleebee goby aswelll =]