Regurgitated food

[Reefyone]

I recently did partial water change, and today fed the cynarina, scolymia and multimouthed drab brain (Symphyllia valenciennesii?). Few hours later, the small pieces of food started to appear in the water and onto the rock - I picked what I could, but new appeared later. I could miss some, because in the evening water looked not so clean, as before, and cynarina didn't look happy.

The tank (container, really) is small, with only HOB power filter, filter floss, carbon and purigen.

How do you work around this problem, did you experienced this problem at all, how can I improve filtration in a small scale (no place for one more sump and a skimmer)? Increasing flow significantly is not desirable, cynarina reacts not good. Did I missed something?

Thanks.

[Twitterbait]

What did you feed them and what are your stats in the tank?

[Reefyone]

Small pieces of salmon, shrimp (worse, because it floats away), mysis shrimp, ocean plankton.

Ammonia, nitrites, phosphates are zero, nitrates 0-5ppm, but recently has red slime despite the good parameters, alkalinity 8.5-10 dKH, SG 1.026, calcium 420 ppm, magnesium 1350ppm, pH 8-8.4.

At beginning I attributed this to the presence of the soft corals in the 20g tank, but now this is LPS only nano-tank, 4.5g shallow container with a small HOB filter and heater, and the LR rubble on the bottom.

Feed less, but more frequently?

But, still, how do you remove excess of the food, including the floated away?

[Loverotties]

Your nitrates are high.one way is to get rid of the filter floss.Also how long do you keep the carbon & purigen in?A day is good.

[Reefyone]

What then use for filtration? And, still, how you remove pieces of food, not picked by filter, or I'm again the only one who has the problem?

Filter floss is changed daily, carbon - once in 2-3 days, purigen - when darkens, as suggested by manufacturer.