Flow rates

[dmh41532]

I have a 24 gallon cube with LPs and sps corals. I have a fluval power circulation pump rated for 300 gph and just the return pump. I’m not entirely sure that’s enough flow. Ife
Noticed one of my acropora is starting to show some slow tissue nicrosis

 

[TX_REEF]

300 gph is likely not enough for SPS. They need strong, indirect, variable flow. pics/video would be helpful. how is your water chemistry?