How do I do this? Cleaning out the gravel will e hard enough, and then theres getting the sand in, ADN the mini-cycle right before the new snails are born! Thats an ammonia spike right there! Will the snails mind the sand? They are mostly bottom dwellers, not wall-climbers like some others I have lol. Also, can I still use my gravel vacum? Will that count for my stirring up the sand to avoid gas bubbles?