Hi everyone! I am a newbie to fish keeping, unless you count my 2g Betta tank and my .5g tank for my African dwarf frogs. I was recently given a very nice 75g tank with all the equipment and the current residents. The tank is housing as of now a 18" rhino pleco, 2 8" Siamese algae eaters (all 3 of these fish are 15-16 yrs old), and a 2" skunk loach who's age I do not know. I am a veterinary technician and avid animal lover so my first priority was the well-being of the current residents. I have had this tank for almost 4 weeks now, the only modifications I have made include completely cleaning the tank when I first took over ownership and replacing the gravel. I have added 2 artificial plants and have just been patient in letting the tank cycle. I kept 25g of the original water and transported it in 5g buckets with the fish and tank when I got this setup. Last night I tested the water and my nitrites all of a sudden are 0 but the nitrates are still high. So does this mean I should do a partial water exchange? If so, how much should I do?
The water has become slightly cloudy, it happened before and resolved on it's own so I figured it was part of the Nitrogen Cycle. Can the current cloudyness be normal? Are these tank symptoms a sign that the cycle is ending?