Hi all, I am new to the fish tank arena. I bought a 10 gallon fresh- filled with spring water, waited a few days then added fish. Stayed clear for about week. I now now should have cycled longer. Did a few water changes the 3 1/2 weeks I've had this tank. Think going through bloom but few fish have died, ammonia levels still spike. Should I clean tank and gravel really good and replace more water? Water smells, changed filter cartridge, put water safe in after partial water change. Don't know what else I should do.