[tang daddy]

Keeping a successful sps tank is not easy, while some have no problems others struggle.

The general rule is weekly or biweekly water changes 10-20%.

Try that out while watching your sps and see if they are growing or not.
Test alk weekly to make sure it is stable while ca and mg too.

I find if I have high po4 my sps stop growing regardless of the big 3 being on the higher side.

It's a balance but sps like clean water, lots of flow and lots of food.

If you can keep your params stable long enough you will see faster growth.