Should I do a small water change near the end of cycling my dry rock in my marine aquarium?
Ammonia levels are 0, nitrites are at 0 or very well close to 0. But nitrates have been explosive over the last few days. There is nothing in the tank, my dry rock that I've been ghost feeding and seeding for about 3 1/2 weeks, and my live sand.
I saw ammonia spike, then come down, nitrites spike then down. And now I'm just worried that these high nitrates could start blooming algae or something. There is no light on the tank, except the occasional flicked on and off when someone ventures into the basement where the tank is located (no natural light at all).
Am I safe to do a small water change, I was thinking 10 - 15 % to help reduce the nitrates then I was going to start my skimmer. I'm fairly new to the hobby as this is my second and far more researched attempt after an 8 year break.
Additional tank info:
size: 75 gallon (280 liters);
rock: 75 lbs (34 kg) from bulk reef supply;
sand: 40 lbs (18 kg) live sand;
temperature: 27 °C (80 °F);
salinity: 35 parts per trillion, specific gravity of 1.026;
skimmer is currently not running during cycling;
lighting is currently off as well.
Using RO/DI system with out water reading 0 total dissolved solids (mixed and heated in a storage container for all my water changes).