300 gallon Tank is full why does that matter? My tank turns over about 8 times/hr. i run a sump with filter socks changed out every 2-3 days. K1 in fluid bed. 2 trickle towers/wet dry consisting of about 1000 bioballs. Aeration in tank and in sump. UV part time. 4+ litres of seachem matrix media. Reactor with pura complet and carbon. No ammonia no nitrite very low nitrate. ph around 7.6 and gh kh are ideal.
They mound up the sand up down the middle. Its probably about 6"-8" deep at its deepest.
She is very active and healthy. Eats a ton. Very interactive when there are people around.