used tank and constant problems?
I have a 75 gallon that i picked up used about 1.5 years ago. they said it was resealed. I also have a 55 and 15 that i have no problems with. The 75 I am almost always fighting some sickness in and now im thinking they used the wrong sealant. Does any one know if that would cause problems with the health of the fish? My amo and trites are always 0 and trates under 20. Weekly 50% water changes. If it was me causing the problems I would think the other tanks would have problems also.