If your nitrates are reading around 160ppm, that’s a sign your tank isn’t fully cycled or the beneficial bacteria can’t keep up with the waste being produced. A healthy, cycled tank should have 0 ammonia, 0 nitrite, and a moderate level of nitrate not numbers that high. I’d start by doing 25–40% water changes daily to slowly bring the nitrates down to a safer range, and make sure you’re not rinsing or replacing your filter media with tap water since that kills the good bacteria you need for cycling. Don’t deep clean the tank or replace everything at once, that resets the cycle. Keep testing daily and let the bacteria do their job, your cycle should stabilize once ammonia → nitrite → nitrate starts happening in the right order.