Hello;
So reading the thread, there is maybe more. I have a frogspawn in my 240 gallon. It sits on the lower right hand side for the last 4 years. Now the bottom heads are always open and love life. The top four barley come out, and this is the same spot they have always been. My clown fish has hosted them, and I assumed he was damaging them. So I left the good ones alone and moved the stressed ones. They have come out a little more but nothing like the bottom ones. They are not as green as the others either.
so what’s my point? Well if he has some frogspawn heads acting normal no issues, then it’s not tank issue. I have three heads that are amazing looking and three that just suck and barley come out.
maybe try feeding the frog spawn with an eye dropper. Blue green hammers and frogspawn are like bubble tip anemonies they like the water a little dirty. Having a 40ppm for those is safe and should be an issue. I have had great success at 5ppm and .40ppm (when my tank is a brat). But something else is going on here. Everything you try is going to be a risk. It could make it better or kill it, (gosh what great options we have). Not to mention it may take a couple days to weeks to months to see changes. What other worries do you have? Have you tried adding carbon media to get rid of any chemical warfare?