I cycled my tank with about70lbs of TBS 36 days now and I havn't had any spikes at all I lost some sponges and a little coraline has whitened but that's it! This was between Hurricanes and Richard was upfront with me about not having a good selection. I visited the store and was still pleased with what he had . the 2 young guys at the store knew what they were talking about and took great care bagging up my purchase. I would have no prob recommending TBS to anyone interested. Best Regards,Brian Jackson