i've heard you can use pool filter sand in you fish tank and it is a lot easier to clean. ive tried play sand and after hours and hours it still didnt work and when i thought it was clear i put my fish in and ended up loosing a lot of them. is there a specific pool filter sand you can use? can anyone give me any info on this or give me a like to some "safe" sand? i tried google-ing but no luck. if it is safe to use what makes it safe and easy to clean?